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Advances in Enhanced Heat Transfer最新文献

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Heat Transfer Investigation of an Offset Strip Fin Using Liquid Crystals 偏置带状翅片的液晶传热研究
Advances in Enhanced Heat Transfer Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1285
Seung-Young Shin, A. Lavine
{"title":"Heat Transfer Investigation of an Offset Strip Fin Using Liquid Crystals","authors":"Seung-Young Shin, A. Lavine","doi":"10.1115/imece2000-1285","DOIUrl":"https://doi.org/10.1115/imece2000-1285","url":null,"abstract":"\u0000 The heat transfer characteristics of an offset strip fin are investigated by the transient liquid crystal method. It is found that there are various flow patterns that may occur, such as separation, reattachment, flow acceleration, expansion, and trailing vortex, and that the heat transfer is directly influenced by them. These flow patterns vary depending on the fin geometry and Reynolds number. For a sparsely stacked fin array (strip thickness-to-fin pitch, t/D < 0.1), the heat transfer pattern is close to a flat plate in a free stream such that the heat transfer is high at the leading edge and decreases along the plate. A distinct pattern change occurs at ReDh ≈ 2300. The heat transfer is high at the leading edge, but decreases rapidly over the first 10–20% of the strip, then increases to a maximum at 25–30%, then decreases again over the rest of the strip. The maximum at 25–30% of the strip indicates flow reattachment there. The same trend is found in a densely stacked fin array (t/D = 0.25) but the pattern change occurs at much lower Reynolds number (ReDh ≈ 800). The influence of flow reattachment is comparable at these Reynolds numbers in both of the fin arrays but it becomes more significant in the densely stacked fin array as Reynolds number increases. It appears that this is due to more dominant flow separation and reattachment, caused by an adverse pressure field near the leading edge of the strip in the densely stacked fin array. The results indicate the importance of the fin pitch in understanding the flow and heat transfer characteristics of offset strip fins.","PeriodicalId":369285,"journal":{"name":"Advances in Enhanced Heat Transfer","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122294782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Numerical Study of Turbulent Boundary Layer Flow Over a Flat Surface With a Single Dimple 具有单个凹痕的平面上湍流边界层流动的数值研究
Advances in Enhanced Heat Transfer Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1282
M. Kithcart, D. Klett
{"title":"A Numerical Study of Turbulent Boundary Layer Flow Over a Flat Surface With a Single Dimple","authors":"M. Kithcart, D. Klett","doi":"10.1115/imece2000-1282","DOIUrl":"https://doi.org/10.1115/imece2000-1282","url":null,"abstract":"\u0000 Turbulent boundary layer flow over a flat surface with a single dimple has been investigated numerically using the FLUENT CFD software package, and compared to an experiment by Ezerskii and Shekhov [1989], which studied the same configuration. The impetus for this work developed as a result of previous studies. Kithcart and Klett [1996], and Afanas’yev and Chudnovskiy [1992], showed that dimpled surfaces enhance heat transfer comparably to surfaces with protrusion roughness elements, but with a much lower drag penalty. However, the actual physical mechanisms involved in this phenomena were only partially known prior this study. Results obtained numerically are in good agreement with the experiment, most notably the confirmation of the existence of a region of enhanced heat transfer created by interaction of the flow with the dimple. In particular, the simulation indicates that heat transfer augmentation is a consequence of the development of a stagnation flow region within the dimple geometry, and the existence of coherent vortical structures which create a periodic flow-field within and immediately downstream of the dimple. This periodicity appears to govern the magnitude of the heat transfer augmentation.","PeriodicalId":369285,"journal":{"name":"Advances in Enhanced Heat Transfer","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114440215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Resonant Heat Transfer Enhancement by Acoustic Excitation in a Side-Heated Rectangular Enclosure 侧面加热矩形腔内声激励增强共振换热
Advances in Enhanced Heat Transfer Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1273
S. Kim, Sung Ki Kim, B. Kang
{"title":"Resonant Heat Transfer Enhancement by Acoustic Excitation in a Side-Heated Rectangular Enclosure","authors":"S. Kim, Sung Ki Kim, B. Kang","doi":"10.1115/imece2000-1273","DOIUrl":"https://doi.org/10.1115/imece2000-1273","url":null,"abstract":"\u0000 Resonant transport enhancement by acoustic excitation in a sidewall-heated rectangular enclosure, in which natural convection flow is initially dominant, is considered. The enclosure is made of Plexiglas which dimensions are 30cm in height, 30cm in width and 30cm in depth. One sidewall of the enclosure is heated by an electrical foil heater and the other sidewall is maintained at a cold temperature by a cold water circulation. A woofer speaker is mounted on the bottom wall of the enclosure to generate pressure fluctuation inside the enclosure. All the walls of the enclosure are thermally insulated. The experimental results obtained indicate that there exists a resonant forcing frequency and velocity amplitude, which enhances thermal transport from the heated wall to the cold wall. It is also observed that, at the resonant state, the air temperatures inside the enclosure gather to an averaged air temperature by enhanced flow mixing. The relationship between the resonant frequency and the boundary layer wave along the vertical sidewall is discussed.","PeriodicalId":369285,"journal":{"name":"Advances in Enhanced Heat Transfer","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129828085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Plate-Fin Surface Optimisation Using Direct-Sizing 使用直接尺寸优化板鳍表面
Advances in Enhanced Heat Transfer Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1284
Eric M. Smith
{"title":"Plate-Fin Surface Optimisation Using Direct-Sizing","authors":"Eric M. Smith","doi":"10.1115/imece2000-1284","DOIUrl":"https://doi.org/10.1115/imece2000-1284","url":null,"abstract":"\u0000 The direct-sizing of heat exchangers applies to that class of heat exchanger in which the local geometry of the core is the same everywhere. Many of our best performing exchangers possess this property. Previous papers discussing this topic were published by Smith (1994, 1997a). Optimisation of rectangular offset strip-fin (ROSF) surfaces involves varying plate spacing b, cell pitch c, and strip-length x in a logical manner. The Manglik and Bergles correlations for flow-friction and heat transfer of ROSF surfaces permits such optimisation.\u0000 The design procedure which follows applies to a two-stream contraflow exchanger assuming perfect gases.","PeriodicalId":369285,"journal":{"name":"Advances in Enhanced Heat Transfer","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129938321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
New Frontiers in Enhanced Heat Transfer 增强传热的新领域
Advances in Enhanced Heat Transfer Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1272
A. Bergles
{"title":"New Frontiers in Enhanced Heat Transfer","authors":"A. Bergles","doi":"10.1115/imece2000-1272","DOIUrl":"https://doi.org/10.1115/imece2000-1272","url":null,"abstract":"\u0000 This review paper considers the many techniques that have been developed to enhance convective heat transfer. A summary is given of the techniques that are effective for the various modes of heat transfer. Of particular interest currently is compound enhancement that involves the simultaneous application of several techniques, so as to produce an enhancement that is larger than the individual techniques operating separately. There are many experimental and analytical challenges that relate to obtaining and applying data. The current advanced enhancement represents 3rd generation heat transfer technology. This technology will find increasing application in all industries.","PeriodicalId":369285,"journal":{"name":"Advances in Enhanced Heat Transfer","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130796921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Turbulent Flow in Closely-Pitched Internally Enhanced Tubes 紧密倾斜内增强管中的湍流
Advances in Enhanced Heat Transfer Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1283
T. S. Ravigururajan, J. Srinivasan
{"title":"Turbulent Flow in Closely-Pitched Internally Enhanced Tubes","authors":"T. S. Ravigururajan, J. Srinivasan","doi":"10.1115/imece2000-1283","DOIUrl":"https://doi.org/10.1115/imece2000-1283","url":null,"abstract":"\u0000 General correlations are developed and verified for friction factor and heat transfer coefficients for single-phase turbulent flow in internally augmented tubes, with low pitch to height ratios. Data from existing investigations were collected for a wide range of tube parameters with e/d: 0.01 to 0.2; p/e: < 8; α/90: 0.2 to 1.0, and flow parameters; Re: 2000 to 250,000 and Pr: 0.66 to 37.6. The data were applied to a linear model to get normalized correlations that were then modified to approach smooth tube correlations, as the roughness variables became very small. The correlations predicted 92% of data from an independent study on microfin tubes within ± 30%. For closely-pitched enhanced tubes, the proposed correlations predict heat transfer/friction factor with better overall accuracy and are suitable for different types of internal enhancements. The heat transfer increases with decreasing p/e ratio and increasing helix angle. The effects of roughness height and pitch on both friction and heat transfer are similar to that experienced in traditional enhancement design (p/e > 8).","PeriodicalId":369285,"journal":{"name":"Advances in Enhanced Heat Transfer","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130582867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental Study of Heat Transfer Properties of Policapillary Materials 毛细管材料传热特性的实验研究
Advances in Enhanced Heat Transfer Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1274
E. M. Veksler, Lev J. Tuchinsky, R. Loutfy
{"title":"Experimental Study of Heat Transfer Properties of Policapillary Materials","authors":"E. M. Veksler, Lev J. Tuchinsky, R. Loutfy","doi":"10.1115/imece2000-1274","DOIUrl":"https://doi.org/10.1115/imece2000-1274","url":null,"abstract":"\u0000 Experimental study has been carried out to investigate convective heat transfer properties of air-cooled multi-channel tubes, fabricated using polycapillary materials technology, subjected to external heating. Practically important expressions for Nusselt number and hydraulic resistance coefficient were obtained for Re = 200–5000 and compared with existing correlations.","PeriodicalId":369285,"journal":{"name":"Advances in Enhanced Heat Transfer","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125288842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of Electric Field on Flow Pattern in Flow Boiling of R-134a: A Visualization Study 电场对R-134a流动沸腾流态影响的可视化研究
Advances in Enhanced Heat Transfer Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1287
Mohsen Salehi, M. Molki, M. Ohadi
{"title":"Effect of Electric Field on Flow Pattern in Flow Boiling of R-134a: A Visualization Study","authors":"Mohsen Salehi, M. Molki, M. Ohadi","doi":"10.1115/imece2000-1287","DOIUrl":"https://doi.org/10.1115/imece2000-1287","url":null,"abstract":"\u0000 An experimental study was performed to qualitatively investigate the effect of an applied electric field on two-phase flow patterns in convective flow boiling of R-134a inside a channel. The experiments were performed in a horizontal channel with 3 mm hydraulic diameter. Inlet vapor qualities of 5%, 40%, and 80% at a flow Reynolds number of 1000 and heat flux of 20 kW/m2 are reported here. The flow regimes were analyzed by a high-speed digital camera. The camera could provide a frames speed of up to 3025 frames/s. The electric field was maintained between the upper and lower walls of the channel. The current visualization study suggests some definitive characteristics of the flow regime and the mechanism behind the EHD-enhanced convective boiling in a narrowly-spaced channel. It is found that at the lower range of applied potential, the flow patterns change from stratified wavy flow to a plug flow type with large slugs spanning the height of the channel. At the higher range of applied potential, a new flow regime took place. This flow pattern was associated with the cross motion of the liquid inside the channel. One reason for heat transfer enhancement can be attributed to the strong heat/momentum transfer between the vapor slugs and liquid cross motions.","PeriodicalId":369285,"journal":{"name":"Advances in Enhanced Heat Transfer","volume":"169 1-4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126022475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Advances in Air-Cooled Heat Exchanger Technology 风冷式换热器技术研究进展
Advances in Enhanced Heat Transfer Pub Date : 2000-11-05 DOI: 10.1615/JENHHEATTRANSF.V14.I1.10
R. Webb, Nae-Hyun Kim
{"title":"Advances in Air-Cooled Heat Exchanger Technology","authors":"R. Webb, Nae-Hyun Kim","doi":"10.1615/JENHHEATTRANSF.V14.I1.10","DOIUrl":"https://doi.org/10.1615/JENHHEATTRANSF.V14.I1.10","url":null,"abstract":"\u0000 This paper describes the author’s current and recent work on advanced technology concepts applied to air cooled heat exchangers. The concepts are applicable to: 1) Automotive heat exchangers (radiators, air-conditioning condensers and evaporators, and charge-air coolers), and 2) Residential air-conditioning.","PeriodicalId":369285,"journal":{"name":"Advances in Enhanced Heat Transfer","volume":"12 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120857869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Influence of Brazing on the Heat Transfer Performance of Fins in Radiators 钎焊对散热器翅片传热性能的影响
Advances in Enhanced Heat Transfer Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1276
B. Sundén, A. Abdon, D. Eriksson
{"title":"Influence of Brazing on the Heat Transfer Performance of Fins in Radiators","authors":"B. Sundén, A. Abdon, D. Eriksson","doi":"10.1115/imece2000-1276","DOIUrl":"https://doi.org/10.1115/imece2000-1276","url":null,"abstract":"\u0000 The performance of a radiator copper fin is considered as the braze joint between the fin and the brass tube is not perfect. The influence of different thermophysical properties of the brazing materials, created intermetallic compounds and possible air gaps is considered. Numerical methods for both two-dimensional and one-dimensional calculations have been developed. The finite volume technique is applied and in the two-dimensional case, boundary fitted coordinates are used. Heat conduction in the fin and braze joint coupled with convective heat transfer in a gas stream is analysed. Results in terms of fin temperature distributions and fin efficiencies are provided. It is found that the detrimental effect of a poor braze joint is not as large as reported previously in the literature.","PeriodicalId":369285,"journal":{"name":"Advances in Enhanced Heat Transfer","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125640674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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