全部評論(5條)
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- 酷酷的小啊蓉 2010-08-26 00:00:00
- 你這個應(yīng)該是線材插頭的試驗相關(guān)的翻譯把。 4.3.2 插頭和套殼的插入力和鎖緊力 拔出力，使用夾具（夾持裝置），不使用夾具 使用夾具將試驗樣品裝到手柄式或具有同等以上性能的試驗機上，測量被壓著好的插頭和套殼的插入力和套殼拔出時的拔出力。測量拔出力時分別測量使用夾具和不使用夾具兩種狀態(tài)。
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- an塔hu蟄71 2010-08-26 00:00:00
- 觸點和龍骨（起保護作用的機械外殼）的插入力和固著力 插入力 9.8N以下 脫離力 使用止動器 58.9以上 未使用止動器 29.4以上 使用夾具將樣品試料安裝到桿式或者其他具有同等以上性能的試驗機上，測量包層后觸點插入龍骨的力，以及脫離龍骨的力。脫離力需區(qū)分使用止動器和不用止動器分別進行。 速度60-110mm/min （按從左向右，從上向下的順序）
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- 小無柳 2010-08-26 00:00:00
- コンタクトとハウジングの挿入力、固著力 接點與殼體的插入力，粘著力 9.8N以下（1.0KGF） 9.8牛頓以下（1.0千克力） 離脫力 脫離力 リテーナ使用 護圈的使用 試料をレバー式又は、これと同等以上の性能を有する試験機に冶具を用いてセットし、圧著されたコンタクトをハウジングに挿入する力と、ハウジングから離脫する力を測定する。離脫力についてはリテーナ使用時と、未使用とで行う。速度 60－110MM/MIN 用杠桿式或與其同等以上性能的試驗機用治具把樣品固定，然后要測定被壓接的接點向殼體壓入的力和從殼體脫離的力。脫離力的測定要兩種情況的力。一種為用護圈時，另一種為不用護圈時。 速度 60-110毫米/分鐘 本人也是不太專業(yè)，以上僅供參考。
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- time多多123 2010-08-26 00:00:00
- コンタクト 接觸 交涉 ハウジング 房屋住宅 殼體 diyi個格子的意思是 結(jié)束和外殼的插入力和固照例 后面的不知道了 是汽車煞車制動方面的嗎？不知道怎么翻譯。
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贊(13)回復(0)
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- 1249680856 2010-08-26 00:00:00
- 連接器的插入力、鎖緊力 拔出力，使用夾具（夾持裝置），不使用夾具 使用夾具將試樣裝到手柄式（連桿式）或具有同等以上性能的試驗機上，測量被固定插頭插入連接器時的插入力以及從連接器中拔出時的拔出力。測量拔出力時分別測量使用夾具和不使用夾具兩種狀態(tài)。
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熱門問答
- 幫忙翻譯下專業(yè)日語！
- 急用，謝謝！
2010-08-25 00:51:12
672
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- 求日語 日文翻譯幫忙翻譯一下。。。萬分感謝
- 請求項2記載の透明硬脆材料のレーザ加工裝置において、前記半透過ミラー及び前記反射ミラーにおける凹面のそれぞれの焦點位置が、同位置となるよう配置したことを特徴とするレーザ加工裝置。
2014-03-16 13:43:20
637
3
- 求專業(yè)的英語達人幫忙翻譯下 萬分感謝
- Caution:Do not place your finger over the vent(it pressurizes the sensor) to test the flow indicator when gas is flowing to the sensor.removing your finger (the restriction) generates a vacuum on the sensor and maydamage the sensor(voiding ... Caution:Do not place your finger over the vent(it pressurizes the sensor) to test the flow indicator when gas is flowing to the sensor.removing your finger (the restriction) generates a vacuum on the sensor and maydamage the sensor(voiding the sensor warraty). Positive pressure applications: If the sample pressure is greater than 30 psign an external pressure regulator(optional) is required upsteram of the analyzer to control of sample flow.a pressure regulator with a metallic diaphragm is recommended to prevent high oxygen reading that cuold result from the use of diaphragms constructed of more gas permeable materisls. If other optionoal sample system components such as coiled metal tubing(samples must be colled to at least 35-40℃ for continuous use)，coalescing filters ，scrubbers，etc.are required install the pressure rugulator after the coiled tubing and bofore the other components and the analyzer.a scrubber requires a flow valve upstream for optimum efficiency and response time and that the analyzer flow valve is opened completely. Atmospheric or slightly negative pressure applications: For accurate high ppb and/or low ppm range measurements，an optional simple pump is required downstream of the analyzer to draw the sample through the analyzer.The cacuum drawn on the analyzer and sensor should not exceed 4”of water. Caution:Use ofpump downstream of the sensor requires the floe control valve upstream of the sensor be completely opened to avoid drawing ercessive vacuum in the sensor，which can damage the sensor. If pump over-loading(due to the limitation of low flow rate of the sample gas)is a comsideration，a second throttle valve on the pump’s inlet side may be necessary to provide a bypass path，as illustrated below，to prevent the pump from over-loading and over-heating while miantaining the required sample flow rate within the above-mentioned parameters 展開
2010-05-07 12:23:38
494
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- 幫忙翻譯下 十萬火急!!!! 萬分感謝！!!!!!!!!!
- thequalitysystemofthecompanyisinconformitywithISO9002.markingcomprehensiveuseofbiotechnology，finechemicaltechnology，thecompanyspecializesinmanufacturingandsellingC-4serie... the quality system of the company is in conformity with ISO 9002 . marking comprehensive use of biotechnology，fine chemical technology，the company specializes in manufacturing and selling C-4 series organic acids and chiral products. these products are widely used in many field such as food， pharmaceutical and chemical industries， and are well accepted by the domestic and overseas market. the main products are L-Malic acid ，DL- Malic acid，L(+)-lartaric acid， fumaric acid， Maleic acid and other organic acids. annual productivity amounts to 20，000 tones. the company has become aninportant manufacturer of C-4 series organic acids in the world. all the products of the company have respectively met the different international advanced standards such as food chemicals codex U.S. pharmacopoeia ， british pharmacopoeia ，and the products have obtained Star-K Kosher Certificate. Above 70% of the company 's products are exported to Japan，Europe，Australia，the United States and Middle East， and they are renown and well recognized in the international markets. the company will devote itself to research and development of enzyme technology and organic electrochemistry. it will continuously introduce new food additives， chiral pharmaceutical intermediates，chiral auxiliaries and chiral drugs. depending on superior quality ， good service and high reputation ， the company is willing to establish a long -term mutually beneficial business partnership with overseas customers and continue to contribute to the happy life of humans. 展開
2011-03-30 01:24:33
558
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- 求助：幫忙幫忙，機械英語NB的幫忙翻譯下
- The effect of beam diameter on the electron skirt in a high pressure scanning electron microscope R. Belkorissata， A. Kadouna， B. Khelifab， C. Mathieub，* aLaboratoire d’Elaboration et de Caracte′risation des Mate′riaux， Univ... The effect of beam diameter on the electron skirt in a high pressure scanning electron microscope R. Belkorissata， A. Kadouna， B. Khelifab， C. Mathieub，* aLaboratoire d’Elaboration et de Caracte′risation des Mate′riaux， Universite′ Djilali Liabe`s de Sidi Bel-Abbes， BP 89， 22000 Sidi Bel-Abbe`s， Algeria bCentre de Calcul et de Mode′lisation de Lens， University D’Artois， Faculte′ Jean Perrin， SP 18 Rue Jean Souvraz， 62307 Lens cedex， France Received 9 February 2004; accepted 19 March 2004 Abstract Helium gas and air are commonly used in the high pressure scanning electron microscope (HPSEM). The presence of a gaseous environment in the specimen chamber modifies the electron beam profile. In order to fully understand the beam-gas interaction， we have investigated the beam-diameter effect for two gases (helium and air) by Monte Carlo simulation. In this calculation， we have assumed that the electron beam is Gaussian and we have explored the influence of the nature of the gas at low voltage. When the beam diameter varies between 1 and 100 nm， there is no influence on the beam profile for these two gases. The resolving power of the HPSEM is not affected by the beamgas interaction. These theoretical results have been compared with experimental images obtained at low voltage under air and helium gases. The variation of image quality at low voltage has confirmed the interest of helium for use in a Field Emission Gun SEM (FEGSEM) in high pressure (or low vacuum) conditions. q 2004 Elsevier Ltd. All rights reserved. Keywords: High pressure scanning electron microscope; Monte Carlo; Electron scattering; Electron profile; Skirting 展開
2018-11-27 12:36:26
467
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- 幾個日語遙控器方面的專業(yè)用語 請達人們幫忙翻譯一下～ 謝謝哦
- 1.銘板（面貼） 2.紅外發(fā)射管 3.陶瓷諧振器 4.片阻 5.片容 6.插件電阻 7.導電膠 8. 紅膠（邦定用的） 9.黑膠（邦定封膠用的） 10.
2010-01-10 06:10:42
466
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- 麻煩英文好的幫忙翻譯下~~~~
- 虛擬儀器技術(shù)與NI的優(yōu)勢及發(fā)展趨勢展望摘要：本文介紹了虛擬儀器的概念及發(fā)展。從虛擬儀器的組成，NI的優(yōu)勢及21世紀發(fā)展趨勢的展望進行了詳細的介紹。... 虛擬儀器技術(shù)與NI的優(yōu)勢及發(fā)展趨勢展望 摘要：本文介紹了虛擬儀器的概念及發(fā)展。從虛擬儀器的組成，NI的優(yōu)勢及21世紀發(fā)展趨勢的展望進行了詳細的介紹。 展開
2008-11-12 05:08:51
400
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- 幫忙翻譯
- AttachingtheSampleChuckYouwillneeda#2Phillipsscrewdriverforthisstep.FollowingthedetailsshowninFig.2-4，installthesamplechuckbyfirstaligningthepinsonthebottomofthesamplechu... Attaching the Sample Chuck You will need a #2 Phillips screwdriver for this step. Following the details shown in Fig. 2-4， install the sample chuck by first aligning the pins on the bottom of the sample chuck with the receptacles on the alpha- SE base. Then tighten the upper two captive thumb screws. Next， use the Phillips screwdriver to tighten the lower two captive screws. Don’t over tighten the screws! It will make it difficult to remove them in the future; just ensure that the screws are snug. Finally， connect the vacuum line from the sample chuck to the vacuum fitting on the alpha-SE base. Releasing the Z-stage Shipping Lock To access the Z-stage shipping lock， first loosen the captive screw on the lamp/shipping lock access door， then open the access door by rotating 180°， as shown in Fig. 2-5. To release the Z-stage shipping lock， stand in front of the ellipsometer and use your left hand to balance the weight of the Z-stage (you will feel it lift up slightly). It will be difficult to release the shipping lock if you apply too much or not enough upward force. Next， use your right hand to move the shipping lock to the operating position (to the right， see Fig. 2-6). If the lock is hard to move， you can use a tool to gain more leverage. The shipping lock will move about 1/3” [8mm] to the right. Checking the Lamp Check that the QTH lamp in fully seated in the lamp housing. The lamp is located behind the actuator screw (see Fig. 2-6) and has two white wires protruding from the back of the lamp. Simply push down on the lamp ensuring that the lamp is fully seated in the lamp housing. Rotate the lamp/shipping lock access door to the closed position and hand tighten the captive screw. 拒絕翻譯軟件，翻譯軟件我自己也會用 不是用翻譯軟件我就看不懂，只是，上來找人翻譯就是希望翻譯出比較容易看懂，不需要自己對照就可以看的說明書，如果用翻譯軟件，根本就詞不達意，還是要自己對著原文件核實 既然用了那么多積分，就希望有相當?shù)某晒?，如果用翻譯軟件混積分，那就是人品問題了 還有，某些人不要不懂亂說混積分 展開
2008-06-22 15:11:54
651
5
- 幫忙翻譯下化工的英語。。用在線詞典翻譯部正確
- A reversed-phase ion-pairing high-performance liquid chromatography (RP-HPIPC) method for the separation of a complex mixture of heparin-derived oligosacchrides has been developed by a stepwise optimization of the mobile phase， in which the... A reversed-phase ion-pairing high-performance liquid chromatography (RP-HPIPC) method for the separation of a complex mixture of heparin-derived oligosacchrides has been developed by a stepwise optimization of the mobile phase， in which the concentration of ion-pairing reagent， mobile phase pH， and acetonitrile concentration were varied. The resolution of more than 30 oligosaccharide components was obtained， under optimized conditions， in an analysis time of less than 30 min. This represents the first RP-HPLC method that can separate a complex mixture of both small and large sulfated oligosaccharides in a single chromatographic step. The heparin-derived oligosaccharides， in this mixture， can also be separated under a second set of RP-HPIPC conditions using a volatile ion-pairing reagent， tributylammonium acetate， to aid in the recovery of individual sulfated oligosaccharides. Moreover， it was possible to replace sodium chloride gradient， required for eluting highly sulfated oligosaccharides， with a fixed， low concentration of a volatile salt， ammonium acetate， by utilizing an acetonitrile gradient. This solvent system might make it possible to directly interface this RP-HPIPC separation with mass spectral analysis. ??2003 Elsevier B.V. All rights reserved. Keywords: Ion-pairing reagents; Gradient elution; Oligosaccharides 展開
2010-06-01 05:49:52
691
4
- 化學專業(yè)英語翻譯 懂的翻譯下 謝謝
- The X-ray diffraction (XRD) pattern was obtained on a Thermo ARL XTRA X-ray diffractometer with Cu K radiation ì 1.54178 ?). In situ XRD characterization was performed n a high-temperature attachment of the X-ray diffractometer. ... The X-ray diffraction (XRD) pattern was obtained on a Thermo ARL XTRA X-ray diffractometer with Cu K radiation ì 1.54178 ?). In situ XRD characterization was performed n a high-temperature attachment of the X-ray diffractometer. Transmission electron microscopy (TEM) observation was performed with a JEOL JEM 2010 high-resolution transmission electron microscope (HRTEM) operated at 200 kV. The UV vis diffuse reflectance spectrum (DRS) was obtained from a Perkin-Elmer Lambda 900 UV vis spectroscopy machine. The precursor was characterized by Fourier transform infrared (FT- R) spectroscopy on a Perkin-Elmer Spectrum One FT-IR machine by using the KBr pellets method. 展開
2010-03-07 19:15:29
632
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- 輪式測距儀日語怎么翻譯
2012-08-16 04:28:25
445
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- 幫忙翻譯一句話
- Catalysts were prepared by pore volume impregnation of ?-alumina
2008-05-28 15:55:47
274
1
- 幫忙翻譯2
- 3.6. Advantages of chromia as promoter in copper-based Catalysts It should also be noted from Figs. 5 and 6 that in the steam reforming reaction to produce hydrogen for fuel cell applications， trace quantities (<0.4 wt.%) of Cr2O3 on Cu... 3.6. Advantages of chromia as promoter in copper-based Catalysts It should also be noted from Figs. 5 and 6 that in the steam reforming reaction to produce hydrogen for fuel cell applications， trace quantities (<0.4 wt.%) of Cr2O3 on Cu not only doubled the activity for the MSR but also halved the amount of CO formed， thereby enhancing H2 production. This improved selectivity reduces the problem of H2 separation from the reaction products in fuel cell applications. An important finding in this research is the role that very small amounts of Cr2O3 play in all the reactions investigated， namely， methanol synthesis， water gas shift and methanol steam reforming. In commercial co-precipitatedcopper-based methanol synthesis catalysts， copper is known to be the active component [3]. More recently， it has becomeestablished that ZnO promotes methanol synthesis and that surface species formed by Cu-ZnO interaction are responsible for methanol synthesis [42]. The role of Cr2O3 in commercial catalysts is thought to be similar to that of Al2O3， which is to act as stabilizer of the structure of the copper catalyst， thereby reducing sintering. In this study， as in a previous one [18] using a different technique todeposit chromia on the surface of skeletal copper， we have shown that Cr2O3 has a significant role in copper-based methanol synthesis from CO2. That role is to improve the methanol yield by reducing the RWGS reaction (Fig. 3) aswas observed in the earlier study [18]. A major finding of this study has been the very strong evidence the Cr2O3 has a synergistic effect on the activity of copper for methanol synthesis， methanol steam reforming and the water gas shift reactions. From Figs. 4 and 5 it can be seen that 0.85 wt.% Cr2O3 enhances the specific activity (mol/hm2 Cu) of skeletal copper 270% for the WGS and 150% for methanol steam reforming. In the case of methanol synthesis (Fig. 2) 0.61 wt.% Cr2O3 increases the specific activity of copper by 67%. The results for the WGS and MS reactions are similar to those obtained under the same reaction conditions using skeletal copper promoted by Cr2O3 which was deposited from sodium chromate in the caustic leach liquor [28]. In that study， the effect of chromia was more pronounced， with an increase in activity of 950% for theWGSand 168% for the MSR reaction， respectively， using skeletal copper containing 0.75 wt.% Cr2O3. For methanol synthesis over Cr2O3 promoted skeletal copperprepared using sodium chromate in the leach liquor， Ma et al. [18] observed no increase in the specific activity of copper. 展開
2006-06-03 16:46:44
580
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- 請高手高手高高手幫忙翻譯下面的設(shè)備名稱
- 請幫忙翻譯下：謝謝！斑點酶解系統(tǒng)自動斑點切取系統(tǒng)蛋白純化系統(tǒng)基因芯片掃描系統(tǒng)二維電泳梯度膠制備系統(tǒng)全自動電泳儀多通道懸液芯片系統(tǒng)體內(nèi)可見光成像系統(tǒng)如果您翻譯的十分準確，我... 請幫忙翻譯下：謝謝！ 斑點酶解系統(tǒng) 自動斑點切取系統(tǒng) 蛋白純化系統(tǒng) 基因芯片掃描系統(tǒng) 二維電泳梯度膠制備系統(tǒng) 全自動電泳儀 多通道懸液芯片系統(tǒng) 體內(nèi)可見光成像系統(tǒng) 如果您翻譯的十分準確，我將再加Z高分（好像是100分）。 我要英文，謝謝！ 展開
2009-07-21 06:02:17
773
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- 幫忙翻譯一段英語
- Plant material and culture conditions have been described (7). Briefly， a diploid tissue culture line， WOO1C， of wild carrot， Daucus carota L.， was maintained in Murashige and Skoog medium supplemented with 0.1 mg of 2，4-dichlorophenoxy... Plant material and culture conditions have been described (7). Briefly， a diploid tissue culture line， WOO1C， of wild carrot， Daucus carota L.， was maintained in Murashige and Skoog medium supplemented with 0.1 mg of 2，4-dichlorophenoxyacetic acid (2，4-D). To regenerate plants from the culture， callus tissue was transferred to the same medium devoid of 2，4-D (embryogenic medium). All experiments were performed with cultures grown in liquid medium. For convenience， cultures grown in 2，4-D-containing medium are referred to as "callus cultures"， and those grown in medium without 2，4-D as "embryo cultures." The growth of callus cultures was measured by the sidearmturbidity method (7). The number of cells at any time point of growth was estimated from turbidity in a Klett-Summerson calorimeter and was expressed in arbitrary units. For example， Klett 100 corresponds to ="2 X 106 cells per ml. The relationship is linear up to Klett 150 in our Klett-Summerson colorimeter. Suspension cultures ofWOOLC cell line are normally maintained at cell densities between 106 and 107 cells per ml in 0.1 mg of 2，4-D per liter (high-density culture) in shake flasks. During a quantitative study on embryogenesis， we found that maximal embryo production can be achieved by first incubating the culture at high density in medium without 2，4-D for one generation time and then diluting it to 2-3 x 104 cells per ml (low-density culture). To compare cultures of comparable density， callus cultures and embryo cultures were subjected to the same procedure. To initiate low-density embryo or callus cultures， an 8-day-old high-density culture grown at the logarithmic phase was washed three times with fresh callus or embryogenic medium and resuspended at 8 x 105 cells per ml for one generation (3 days) in its corresponding medium. It was then diluted to 2 x 104 cells per ml; 20 ml of the culture was incubated in a plastic Petri dish (9 cm in diameter) at 240C. The morphogenetic events of the cultures were examined and photographed under a dissecting microscope. 請不要用google的那個，我看不懂~~ 展開
2008-02-19 03:32:04
531
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- 幫忙翻譯一下，謝謝
- IFRS13willhelpincreasetransparencywhenentitiesusemodelstomeasurefairvalue，particularlywhenusersneedmoreinformationaboutmeasurementuncertainty，suchaswhenthemarketforanasse... IFRS 13 will help increase transparency when entities use models to measure fair value， particularly when users need more information about measurement uncertainty， such as when the market for an asset or a liability has become less active. IFRS 13 requires entities to disclose information about the valuation techniques and inputs used to measure fair value， as well as information about the uncertainty inherent in fair value measurements (which was of particular concern during the global fi nancial crisis). Some of those disclosures， including the fair value hierarchy， were already introduced in March 2009 through an amendment to IFRS 7 Financial Instruments: Disclosures. Those disclosures have been relocated to IFRS 13. The requirements in IFRS 13 also incorporate the guidance in a FASB Staff Position (FSP) issued in April 2009. 展開
2012-04-29 01:58:49
511
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- 高手幫忙翻譯！！+100
- 虛擬儀器是一種新的測試與測控技術(shù)，近年來得到了迅速發(fā)展，基于虛擬儀器的機器視覺系統(tǒng)就是其領(lǐng)域的一個重要分支。本文圍繞基于虛擬儀器的機器視覺有關(guān)理論和其在玻璃瓶口缺陷檢測中... 虛擬儀器是一種新的測試與測控技術(shù)，近年來得到了迅速發(fā)展，基于虛擬儀器的機器視覺系統(tǒng)就是其領(lǐng)域的一個重要分支。本文圍繞基于虛擬儀器的機器視覺有關(guān)理論和其在玻璃瓶口缺陷檢測中的具體應(yīng)用進行了研究。 針對玻璃瓶這一對象檢測的高精度、高準確度、實時性的特點，本文提出了一種基于LabVIEW的數(shù)字圖像處理檢測方案，并在設(shè)計過程中解決了一系列關(guān)鍵問題：利用硬件和軟件的編程實現(xiàn)了對玻璃瓶口的缺陷監(jiān)測；使用閾值進行圖像的二值化處理，并進行開啟、閉合以增強圖像質(zhì)量；使用Vision Builder AI對有故障的圖像進行故障特征識別； 通過理論研究與實驗，證明了本文所提出的玻璃瓶口缺陷監(jiān)測方法是有效和可行的，為其機器視覺檢測的進一步研究和開發(fā)奠定了很好的基礎(chǔ) 請用專業(yè)術(shù)語，不要用在線翻譯。謝謝····好可以多加分 展開
2008-06-10 11:03:29
488
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- 幫忙翻譯論文摘要
- 換熱器是化工、煉油、動力、食品、輕工等許多工業(yè)部門廣泛應(yīng)用的一種通用設(shè)備。其性能的好壞直接影響過程工業(yè)熱經(jīng)濟性的高低。近年來，由于能源危機，強化傳熱技術(shù)和新型換熱器的研究... 換熱器是化工、煉油、動力、食品、輕工等許多工業(yè)部門廣泛應(yīng)用的一種通用設(shè)備。其性能的好壞直接影響過程工業(yè)熱經(jīng)濟性的高低。近年來，由于能源危機，強化傳熱技術(shù)和新型換熱器的研究得了飛速發(fā)展。本次的實驗是在前人設(shè)計的帶螺旋折流片（下簡稱螺旋片）換熱器的基礎(chǔ)上再在內(nèi)圓管多加上擾流柱，分析不同操作參數(shù)和結(jié)構(gòu)參數(shù)條件下流體傳熱情況，由此得出影響換熱器傳熱性能的條件，為進一步研究靜態(tài)混合器傳熱情況和其在實際工程及設(shè)計中的應(yīng)用奠定基礎(chǔ)。 本文對換熱器進行了研究，測得殼程空氣進出口溫度，利用溫差傳熱，以努塞爾準數(shù)作為衡量換熱器傳熱性能的標準，分別考察了雷諾數(shù)對努塞爾準數(shù)的影響，并與空管進行了比較。換熱器器中由于擾流柱的作用，使進入管中的流體在流經(jīng)擾流柱時產(chǎn)生旋渦，有效地消除了徑向主流道的速度梯度和溫度梯度。因傳熱邊界層大大減薄，使得邊界層內(nèi)流體不斷得到更新，熱阻下降，傳熱過程得到強化。 通過實驗可以得出一些結(jié)論: 由于有螺旋片同擾流柱的存在使得擾動螺旋型換熱器的傳熱效果明顯要優(yōu)于圓滑管型換熱器同螺旋型換熱器;螺旋片使流體具有向外甩開的離心力，流體在流過擾流柱時因被分流、切割、再生，不僅加速了流速并且在柱后形成渦流，加速壁面流體的更新，減薄粘性邊界層底層的厚度，從而提高了傳熱性能; 同一模型在不同Re下，隨著Re的增加，Nu也隨著增加，在不計阻力時，模型的傳熱效果隨著Re的增加而提高 不要在線翻譯的。希望幫一忙！ 如果好再加100分，我現(xiàn)在非常急，馬上就要交了。 展開
2018-11-16 22:06:50
432
0
- 幫忙翻譯論文摘要
- 換熱器是化工、煉油、動力、食品、輕工等許多工業(yè)部門廣泛應(yīng)用的一種通用設(shè)備。其性能的好壞直接影響過程工業(yè)熱經(jīng)濟性的高低。近年來，由于能源危機，強化傳熱技術(shù)和新型換熱器的研究... 換熱器是化工、煉油、動力、食品、輕工等許多工業(yè)部門廣泛應(yīng)用的一種通用設(shè)備。其性能的好壞直接影響過程工業(yè)熱經(jīng)濟性的高低。近年來，由于能源危機，強化傳熱技術(shù)和新型換熱器的研究得了飛速發(fā)展。本次的實驗是在前人設(shè)計的帶螺旋折流片（下簡稱螺旋片）換熱器的基礎(chǔ)上再在內(nèi)圓管多加上擾流柱，分析不同操作參數(shù)和結(jié)構(gòu)參數(shù)條件下流體傳熱情況，由此得出影響換熱器傳熱性能的條件，為進一步研究靜態(tài)混合器傳熱情況和其在實際工程及設(shè)計中的應(yīng)用奠定基礎(chǔ)。 本文對換熱器進行了研究，測得殼程空氣進出口溫度，利用溫差傳熱，以努塞爾準數(shù)作為衡量換熱器傳熱性能的標準，分別考察了雷諾數(shù)對努塞爾準數(shù)的影響，并與空管進行了比較。換熱器器中由于擾流柱的作用，使進入管中的流體在流經(jīng)擾流柱時產(chǎn)生旋渦，有效地消除了徑向主流道的速度梯度和溫度梯度。因傳熱邊界層大大減薄，使得邊界層內(nèi)流體不斷得到更新，熱阻下降，傳熱過程得到強化。 通過實驗可以得出一些結(jié)論: 由于有螺旋片同擾流柱的存在使得擾動螺旋型換熱器的傳熱效果明顯要優(yōu)于圓滑管型換熱器同螺旋型換熱器;螺旋片使流體具有向外甩開的離心力，流體在流過擾流柱時因被分流、切割、再生，不僅加速了流速并且在柱后形成渦流，加速壁面流體的更新，減薄粘性邊界層底層的厚度，從而提高了傳熱性能; 同一模型在不同Re下，隨著Re的增加，Nu也隨著增加，在不計阻力時，模型的傳熱效果隨著Re的增加而提高 不要翻譯軟件翻譯的。如果好再加分 展開
2018-11-25 12:54:46
431
0
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