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ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels最新文献

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High Heat Flux Dissipation Using Symmetric Dual-Taper Manifold in Pool Boiling 对称双锥流管在池沸腾中的高热流密度耗散
ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels Pub Date : 2019-10-29 DOI: 10.1115/icnmm2019-4292
A. Chauhan, S. Kandlikar
{"title":"High Heat Flux Dissipation Using Symmetric Dual-Taper Manifold in Pool Boiling","authors":"A. Chauhan, S. Kandlikar","doi":"10.1115/icnmm2019-4292","DOIUrl":"https://doi.org/10.1115/icnmm2019-4292","url":null,"abstract":"\u0000 The trend of miniaturization in electronics presents a great challenge in the thermal management of devices. The continuous increase in the number of transistors in the processor leads to high heat flux generation, limiting the performance of the device. Boiling heat transfer offers a great heat removal competency while maintaining the low chip temperatures. The critical heat flux (CHF) dictates the maximum heat removal ability, and heat transfer coefficient (HTC) defines the efficiency of the boiling process. This pool boiling study is focused on using a manifold containing a symmetric dual taper over the heating surface. The heat transfer performance of this configuration is evaluated for different taper angles in the manifold. The macro-convection assisted by vapor columns during boiling enhance the CHF and HTC limit significantly. A CHF of 287 W/cm2 with an HTC of 116 kW/cm2°C was achieved with a plain copper surface, representing greater than a 2-fold increases in each over a plain surface.","PeriodicalId":221056,"journal":{"name":"ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128115358","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: 5
Non-Invasive Temperature Measurement for Polyimid-Based Microstructured Devices 基于聚酰亚胺的微结构器件的无创温度测量
ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels Pub Date : 2019-10-29 DOI: 10.1115/icnmm2019-4207
J. Bobers, F. Reichmann, J. Zimmermann, N. Kockmann
{"title":"Non-Invasive Temperature Measurement for Polyimid-Based Microstructured Devices","authors":"J. Bobers, F. Reichmann, J. Zimmermann, N. Kockmann","doi":"10.1115/icnmm2019-4207","DOIUrl":"https://doi.org/10.1115/icnmm2019-4207","url":null,"abstract":"\u0000 Besides the common benefits of micro-structured reactors such as enhanced mass and heat transfer caused by a high specific surface and enhanced mixing, they have also drawbacks due to their tiny dimensions. Non-invasive temperature measurement is an important issue for micro process engineering regarding to process control and safety issues. High resolution and robustness are requirements which should be met by the temperature measuring method. Thin film technology combines the possibility to manufacture micro scaled structures with great flexibility in choosing material and geometry of the structures. Layers of aluminum with a thickness in nanometer range are deposited on flexible polyimide foil and structured lithographically to obtain electrical conductor tracks which are used as temperature sensors based on their electrical resistance. The produced temperature sensors were calibrated in the range from 20 to 70 °C and the accuracy of the sensors was checked.","PeriodicalId":221056,"journal":{"name":"ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124433635","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
Pressure Drop of Liquid-Liquid Taylor Flow in Mini-Scale Coiled and Curved Tubing 小型连续弯曲管中液-液泰勒流的压降
ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels Pub Date : 2019-10-29 DOI: 10.1115/icnmm2019-4219
W. Adrugi, Y. Muzychka, K. Pope
{"title":"Pressure Drop of Liquid-Liquid Taylor Flow in Mini-Scale Coiled and Curved Tubing","authors":"W. Adrugi, Y. Muzychka, K. Pope","doi":"10.1115/icnmm2019-4219","DOIUrl":"https://doi.org/10.1115/icnmm2019-4219","url":null,"abstract":"\u0000 This paper presents an experimental study on pressure drop using non-boiling liquid-liquid Taylor flow in mini scale coiled and curved tubing. Experiments were carried out to measure the pressure drop characteristics by varying the numbers of turns in coiled tubes and the lengths of curved tubes of less than one turn, such that Dean number, Reynolds number, radius of curvature, and coil pitch were considered. A set of narrow coiled tubes (ID = 1.59 mm, 1.27 mm, 1.016 mm) was used as test sections with different radii of curvature and overall lengths, and thus a different quantity of turns. Water and 1 cSt low viscosity silicone oil were used to create a segmented slug flow. An asymptotic model is developed based on the experimental results and previous models to predict the pressure drop, based on Dean number and dimensionless slug length. The effects of varying tube curvature and tube diameter are also studied. The results provide new insights into the effect of coiling and secondary flow on pressure drop for a liquid-liquid Taylor flow in mini scale systems.","PeriodicalId":221056,"journal":{"name":"ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130571757","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
Flow Maldistribution Effects on the Temperature Uniformity in Double-Layered Microchannel Heat Sinks 流动不均匀分布对双层微通道散热器温度均匀性的影响
ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels Pub Date : 2019-10-29 DOI: 10.1115/icnmm2019-4284
C. Nonino, S. Savino
{"title":"Flow Maldistribution Effects on the Temperature Uniformity in Double-Layered Microchannel Heat Sinks","authors":"C. Nonino, S. Savino","doi":"10.1115/icnmm2019-4284","DOIUrl":"https://doi.org/10.1115/icnmm2019-4284","url":null,"abstract":"\u0000 A numerical investigation is carried out on the effects of flow maldistribution on the temperature uniformity and overall thermal resistance in double-layered microchannel heat sinks. Different flow maldistribution models accounting for the effects of some typical header designs are considered together with different combinations of the average inlet velocity in the two layers of microchannels for a given total mass flow rate. The numerical simulations are carried out using an in-house FEM procedure previously developed by the authors for the analysis of cross-flow microchannel heat exchangers.","PeriodicalId":221056,"journal":{"name":"ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122974743","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
Numerical Study on Gas-Yield Power-Law Fluid in T-Junction Minichannel t型结小通道产气量幂律流体的数值研究
ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels Pub Date : 2019-10-29 DOI: 10.1115/icnmm2019-4253
Abdalsalam Ihmoudah, M. Awad, A. Rahman, S. Butt
{"title":"Numerical Study on Gas-Yield Power-Law Fluid in T-Junction Minichannel","authors":"Abdalsalam Ihmoudah, M. Awad, A. Rahman, S. Butt","doi":"10.1115/icnmm2019-4253","DOIUrl":"https://doi.org/10.1115/icnmm2019-4253","url":null,"abstract":"\u0000 In this study, a computational examination of Taylor bubbles was performed for gas/non-Newtonian fluid two-phase flows developed in a minichannel T-junction mixer with a hydraulic diameter of 1 mm. The investigations employed three separate aqueous xanthan gum solutions at concentrations of 0.05, 0.1 and 0.15 w/w, which are referred to as non-Newtonian (yield power-law) fluids. The effective concentration of the xanthan gum solutions and superficial velocity of the inlet liquid phase on the length, velocity, and shape of the Taylor bubbles was studied using the ANSYS FLUENT 19 software package. The simulation results show an increase in bubble velocity with increasing film thickness, particularly in solutions of higher viscosity XG-0.15%. Furthermore, bubble lengths decreased as the xanthan gum concentrations increased, but bubble shapes underwent alterations when the concentrations increased. Another interesting result of the tests shows that when the liquid inlet velocity increases, bubble lengths decrease during lower liquid superficial velocity, whereas during higher velocities, they change only slightly after increases in concentration. Finally, with increasing XG concentration, the liquid film thickness around the bubble increased. The results show good agreement with correlations after modifying a capillary number (Ca*) for non-Newtonian liquids in all cases.","PeriodicalId":221056,"journal":{"name":"ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114691537","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
Heat Transfer Investigation of an Additively Manufactured Minichannel Heat Exchanger 增材制造小通道换热器的传热特性研究
ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels Pub Date : 2019-10-29 DOI: 10.1115/icnmm2019-4231
Hamidreza Rastan, A. Abdi, M. Ignatowicz, B. Hamawandi, P. Lee, B. Palm
{"title":"Heat Transfer Investigation of an Additively Manufactured Minichannel Heat Exchanger","authors":"Hamidreza Rastan, A. Abdi, M. Ignatowicz, B. Hamawandi, P. Lee, B. Palm","doi":"10.1115/icnmm2019-4231","DOIUrl":"https://doi.org/10.1115/icnmm2019-4231","url":null,"abstract":"\u0000 This study investigates the thermal performance of laminar single-phase flow in an additively manufactured minichannel heat exchanger both experimentally and numerically. Distilled water was employed as the working fluid, and the minichannel heat exchanger was made from aluminum alloy (AlSi10Mg) through direct metal laser sintering (DMLS). The minichannel was designed with a hydraulic diameter of 2.86 mm. The Reynolds number ranged from 175 to 1360, and the heat exchanger was tested under two different heat fluxes of 1.5 kWm−2 and 3 kWm−2. A detailed experiment was conducted to obtain the thermal properties of AlSi10Mg. Furthermore, the heat transfer characteristics of the minichannel heat exchanger was analyzed numerically by solving a three-dimensional conjugate heat transfer using the COMSOL Multiphysics® to verify the experimental results. The experimental results were also compared to widely accepted correlations in literature. It is found that 95% and 79% of the experimental data are within ±10% range of both the simulation results and the values from the existing correlations, respectively. Hence, the good agreement found between the experimental and simulation results highlights the possibility of the DMLS technique as a promising method for manufacturing future multiport minichannel heat exchangers.","PeriodicalId":221056,"journal":{"name":"ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127799922","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
A Compact Condenser for Thermal Desalination: Experimental Characterization and System Level Impact 用于热脱盐的紧凑型冷凝器:实验表征和系统级影响
ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels Pub Date : 2019-10-29 DOI: 10.1115/icnmm2019-4252
Ramuel Safarkoolan, X. Mu, V. Narayanan
{"title":"A Compact Condenser for Thermal Desalination: Experimental Characterization and System Level Impact","authors":"Ramuel Safarkoolan, X. Mu, V. Narayanan","doi":"10.1115/icnmm2019-4252","DOIUrl":"https://doi.org/10.1115/icnmm2019-4252","url":null,"abstract":"\u0000 Condensation heat transfer occurs in a variety of applications such as power generation, desalination, and thermal management. In this paper, the system level impact of using a microchannel condenser in multi-stage flash desalination is presented using a simple thermal model of the condenser. The condenser is comprised of several plates with internal microscale pin fin arrays through which cooling fluid (brine) flows. Externally, water vapor condenses in between the plates and is drained by gravity. The fabrication and thermal performance of a small-scale microchannel condenser is experimentally characterized. Condensation experiments are performed under sub-atmospheric conditions relevant to multi-stage flash desalination stage temperatures with varying flow rates of the cooling fluid, cooling fluid inlet temperature and condensation pressure.","PeriodicalId":221056,"journal":{"name":"ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127911032","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
Optimization of Hybrid Hydrophilic-Hydrophobic Surfaces for Dropwise Condensation Enhancement 亲疏水杂化表面水滴增强冷凝性能的优化
ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels Pub Date : 2019-10-29 DOI: 10.1115/icnmm2019-4291
G. Croce, P. D’Agaro, N. Suzzi
{"title":"Optimization of Hybrid Hydrophilic-Hydrophobic Surfaces for Dropwise Condensation Enhancement","authors":"G. Croce, P. D’Agaro, N. Suzzi","doi":"10.1115/icnmm2019-4291","DOIUrl":"https://doi.org/10.1115/icnmm2019-4291","url":null,"abstract":"\u0000 A langrangian-based phenomenological model, following the evolution of the individual droplets nucleating at random positions, is applied to the simulation and optimization of hybrid, mixed hydrophobic and hydrophilic surfaces. The proposed mathematical model was originally developed to simulate droplets pattern evolution in the framework of in-flight icing problems and takes into account the surface tension effects (via the advancing and receding contact angle values), the external force balance on the single droplets, as well as the both the condensing and coalescence process. Here, the model is extended to the case of an arbitrary curved substrate surface and a parametric analysis of different cases is carried out, looking for the parameters that help to identify the optimal design for a given set of wettability properties, nucleation site density and wet surface condensation rates. A discussion on the sensitivity of the solutions with respect to the expected high uncertainties on the estimate of some of these parameters in actual practical problems is also presented, in order to assess the effectiveness of the simulation as a design tool. The analysis is carried out for condensation enhancement on both plane surfaces and mini or micro tubes. Comparison with experimental, open literature data ensure the reliability of the approach for both geometries.","PeriodicalId":221056,"journal":{"name":"ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134252792","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
Performance of Concentrator Photovoltaic Systems Integrated With Double Layer Microchannel Heat Sink 集成双层微通道散热器的聚光光伏系统性能研究
ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels Pub Date : 2019-10-29 DOI: 10.1115/icnmm2019-4259
A. Radwan, M. Awad, S. Ookawara, Mahmoud A. Ahmed
{"title":"Performance of Concentrator Photovoltaic Systems Integrated With Double Layer Microchannel Heat Sink","authors":"A. Radwan, M. Awad, S. Ookawara, Mahmoud A. Ahmed","doi":"10.1115/icnmm2019-4259","DOIUrl":"https://doi.org/10.1115/icnmm2019-4259","url":null,"abstract":"\u0000 In this study, a new design of double layer microchannel heat sink (DL-MCHS) has been monolithically fabricated using 3D metal printer and experimentally examined as a heat sink for concentrator photovoltaic (CPV) systems. Single phase liquid cooling using ethanol and flow boiling cooling using NOVEC-7000 coolant in the designed DL-MCHS are experimentally compared. The results proved that using the flow boiling cooling technique for the CPV systems attained a lower solar cell temperature with high temperature uniformity. In more details, flow boiling in counterflow (CF) operated DL-MCHS, attained a very low solar cell temperature close to the NOVEC-7000 boiling point with temperature uniformity of 0.2 °C over a wide range of coolant flow rate from 25–250 ml/hr.","PeriodicalId":221056,"journal":{"name":"ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124166846","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
Performance Analysis of Concentrator Photovoltaic/Microchannel Heat Sink System Using Nanofluid 纳米流体聚光光伏/微通道散热系统性能分析
ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels Pub Date : 2019-10-29 DOI: 10.1115/icnmm2019-4256
A. Radwan, M. Awad, S. Ookawara, Mahmoud A. Ahmed
{"title":"Performance Analysis of Concentrator Photovoltaic/Microchannel Heat Sink System Using Nanofluid","authors":"A. Radwan, M. Awad, S. Ookawara, Mahmoud A. Ahmed","doi":"10.1115/icnmm2019-4256","DOIUrl":"https://doi.org/10.1115/icnmm2019-4256","url":null,"abstract":"\u0000 In this study, the performance of concentrator photovoltaic (CPV) cell enhanced by using double layer microchannel heat sink (DL-MCHS) with nanofluid is investigated. Pure ethanol and 0.2 % Vol. Al2O3-ethanol are utilized to reduce the solar cell temperature under indoor solar concentration ratio of 5.7 Suns. The designed DL-MCHS is monolithically fabricated from Maraging steel using 3D metal printer. The experimental results showed that using parallel flow (PF) operation mode of the designed DL-MCHS is favourable for cooling the CPV system compared with the counter flow (CF) operation mode. In the cooled CPV using PF mode, the open circuit voltage enhancement is about 12.7% in comparison to the uncooled case. The nanofluid results also showed a reduction in the solar cell temperature in comparison with the pure coolant. The current results can be used as a validation step for accurate numerical modelling of nanofluid applications in CPV system cooling.","PeriodicalId":221056,"journal":{"name":"ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132648684","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
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