Friction factor and heat transfer in multiple microchannels with uniform flow distribution

Park, Hee Sung; Punch, Jeff

doi:10.1016/j.ijheatmasstransfer.2008.02.009

Cited by 75 publications

(33 citation statements)

References 21 publications

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“…For the flow friction, the developing flow assumption was ruled out because the entrance effect was found to be negligible in the experimental range (Park and Punch 2008). Heat Fig.…”

Section: Calculationsmentioning

confidence: 99%

“…8, 9 and commercial code have been developed from macroscale channel flow so that can possibly induce discrepancies in describing microscale heat transfer. In this respect, a new correlation proposed by Park and Punch (2008) was employed to calculate the heat transfer rate in the microchannel heat exchangers as follows.…”

Section: Calculationsmentioning

confidence: 99%

“…It has been observed that the microscale flow motion is different from macroscale flow and classical theory cannot predict the microscale flow and heat transfer with good accuracy, even though the fluid flow and heat transfer in microchannel heat exchangers is significant for the design of an efficient cooling device. Consequently, in this paper, microchannel heat exchangers were designed with correlating heat transfer rate in terms of Brinkman number in order to improve the prediction accuracy of the calculation (Park and Punch 2008). The microchannel heat exchanger was optimized with a pump that can be employed to cooling.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the accurate prediction of heat transfer rate is significant in design of microchannel heat exchanger, because the small amount of difference in thermal resistance (°C/W) can cause large temperature difference in the application. In this regards, Park and Punch (2008) conducted experimental study on the heat transfer rate in the microchannel heat exchangers and proposed an empirical correlation of heat transfer rate in terms of Nu/(Re 0.62 Pr 0.33 ) and Brinkman number. In this paper, the correlation from Park and Punch (2008) was employed in the calculation of the cooling performance.…”

Section: Introductionmentioning

confidence: 99%

“…In this regards, Park and Punch (2008) conducted experimental study on the heat transfer rate in the microchannel heat exchangers and proposed an empirical correlation of heat transfer rate in terms of Nu/(Re 0.62 Pr 0.33 ) and Brinkman number. In this paper, the correlation from Park and Punch (2008) was employed in the calculation of the cooling performance. Theoretical and numerical calculations were also carried out in order to be compared with the experimental results.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A microchannel heat exchanger design for microelectronics cooling correlating the heat transfer rate in terms of Brinkman number

Park

2009

Microsyst Technol

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Microchannel heat exchangers are a well known device in the application of microelectronics cooling. In this paper, liquid microchannel heat exchangers were designed and investigated with varying channel width in order to find the maximum cooling efficiency when combined with pumping performance. A recently developed correlation of heat transfer rate in terms of Nusselt number and Brinkman number was adopted to predict cooling efficiency of the microchannel heat exchanger and was compared with the experimental results. Conventional heat transfer theories and numerical commercial code were also used to predict the cooling efficiency. The measured minimum thermal resistance of the microchannel heat exchanger showed a good agreement with the prediction from the new correlation, whereas calculation results from conventional theories and numerical code showed large divergence. It can be seen that the microchannel heat exchanger can be optimized when combined with pumping performance. In addition, the new correlation of heat transfer rate in terms of Brinkman number can be quite a useful tool in design of microchannel heat exchanger.

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“…For the flow friction, the developing flow assumption was ruled out because the entrance effect was found to be negligible in the experimental range (Park and Punch 2008). Heat Fig.…”

Section: Calculationsmentioning

confidence: 99%

Section: Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A microchannel heat exchanger design for microelectronics cooling correlating the heat transfer rate in terms of Brinkman number

Park

2009

Microsyst Technol

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Investigation on liquid flow characteristics in microtubes

Chen

2014

AIChE Journal

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in Wiley Online Library (wileyonlinelibrary.com)The fundamental understanding and prediction of liquid flow characteristics in microscale are important to control the performance of microfluidic devices. However, fundamental questions about liquid flow characteristics in microscale have not been settled yet and systematical investigation is needed. A systematical investigation on liquid flow characteristics through microtubes with diameters varying from 44.5-1011 lm and relative roughness in the range 0.02-4.32% in the Reynolds number range 29-11,644 was performed in this work, using water as working fluid. Experimental results indicated that early transition occurred when the diameter was smaller than 1000 lm, the transitional flow characteristics for smooth microtubes differed from rough microtubes and the friction factor in turbulent region for rough microtubes was larger than conventional theory. Moreover, a parameter a was proposed to describe the characteristic of microtube. The characteristic parameter was used to calculate the critical Reynolds number and the friction factor in turbulent region for microscale. V C 2014 American Institute of Chemical Engineers AIChE J, 61: 718-735, 2015 SS and FS stand for stainless steel and fused silica, respectively.

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Numerical investigation of gas–liquid and liquid–liquidTaylor flow through a circular microchannel with a sudden expansion

2021

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This paper investigates a CFD‐based analysis for gas–liquid and liquid–liquid Taylor flows through a circular axisymmetric microchannel with a sudden enlargement. A series of simulations are conducted by exploring the influence of different superficial velocity ratios, apparent viscosities, and channel expansion on the hydrodynamics of slug flow. A concentric junction introduces dispersed airflow into a continuous flow of water for gas–liquid flow, and the junction introduces dispersed water into a continuous flow of dodecane for liquid–liquid flow. The air‐bubble and water‐slug evolution processes, slug breakup, and slug expansion are investigated. In all cases, the lengths of air bubbles and water slugs increase with increasing superficial velocity ratio, particularly before the expansion. For gas–liquid flow, the apparent viscosity ratio causes a fluctuating interface over the uniform film region. However, the water slug length is shorter and the film region is slightly thicker in liquid–liquid compared to gas–liquid flow. The numerical analysis developed in this paper is in good agreement with the existing correlations and experimental data in the literature.

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Friction factor and heat transfer in multiple microchannels with uniform flow distribution

Cited by 75 publications

References 21 publications

A microchannel heat exchanger design for microelectronics cooling correlating the heat transfer rate in terms of Brinkman number

A microchannel heat exchanger design for microelectronics cooling correlating the heat transfer rate in terms of Brinkman number

Investigation on liquid flow characteristics in microtubes

Numerical investigation of gas–liquid and liquid–liquidTaylor flow through a circular microchannel with a sudden expansion

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