An analysis of the effect of the footprint orientation on the thermal-hydraulic performance of a microchannels heat sink during flow boiling of R245fa

Leão, Hugo Leonardo Souza Lara; Chávez, Cristian A.; Nascimento, Francisco Júlio do; Ribatski, Gherhardt

doi:10.1016/j.applthermaleng.2015.07.043

Cited by 28 publications

(10 citation statements)

References 45 publications

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“…The experimental apparatus and the data regression procedures were validated by comparing single-phase flow data against predictions from wellestablished correlations from literature for pressure drop and heat transfer coefficient. The data considered in the validation process were obtained for R245fa as presented by Leão et al (2015). The method of Shah and London (1978) for rectangular channel and laminar flow captured reasonably well the experimental trends for the frictional pressure drop, and the method of Stephan and Preußer (1979) for laminar flow, uniform heat flux, simultaneous developing flow region and circular ducts also captured reasonably well the trends of the experimental results for heat transfer coefficient.…”

Section: Data Reductionmentioning

confidence: 66%

“…1, and an auxiliary circuit, used to condensate and cool down the test fluid of the refrigerant loop. Both circuits are well detailed by do Nascimento et al 2013and Leão et al (2014Leão et al ( , 2015.…”

Section: Methodsmentioning

confidence: 92%

“…Particularly in the present study, the results were obtained for the refrigerant R600a. The data for R134a, R407C and R245fa were obtained in the same test facility and were previously published by do Nascimento et al 2013and Leão et al (2014Leão et al ( , 2015.…”

Section: Methodsmentioning

confidence: 95%

“…The distance between two Figure 1. Schematics of the test section and the experimental setup (Leão et al, 2015). consecutive microchannels is 176.9 µm.…”

Section: Methodsmentioning

confidence: 99%

“…For those interested on a detailed description of the data regression procedure, the previous paper by Leão et al (2015) is recommended as reference. 1.3…”

Section: Data Reductionmentioning

confidence: 99%

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COMPARATIVE ANALYSES OF THE THERMAL PERFORMANCE OF REFRIGERANTS R134A, R245fa, R407C AND R600a DURING FLOW BOILING IN A MICROCHANNELS HEAT SINK

Leão

Marchetto

Ribatski

2018

RETERM

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A comparative study of the performance of of refrigerants R134a, R407C, R245fa and R600a during flow boiling was performed for a 123x494 µm2 heat sink composed of 50 parallel rectangular microchannels. Heat transfer experimental results for heat fluxes up to 310 kW/m2, mass velocities from 300 to 800 kg/(m2 s), liquid subcoolings of 5 and 10 °C and saturation temperature close to 30 ºC were obtained. Global heat transfer coefficients (footprint) up to 10 kW/(m2 °C) were found. The liquid superheating necessary for the onset of nucleate boiling (ONB) was also characterized, and the fluids R245fa and R407C presented the highest and lowest, respectively, superheating to trigger the boiling process. Moreover, for a fixed averaged vapor quality, the average effective heat transfer coefficient increases with increasing mass velocity and liquid subcooling. The refrigerants R600a and R407C presented the highest and the lowest heat transfer coefficients, respectively. Five heat transfer predictive methods from literature provided accurate predictions of the data for R134a, R245fa and R600a, capturing most of the data trends. No one method provided accurate predictions of the heat transfer coefficient data of R407C.

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Section: Data Reductionmentioning

confidence: 66%

Section: Methodsmentioning

confidence: 92%

Section: Methodsmentioning

confidence: 95%

“…The distance between two Figure 1. Schematics of the test section and the experimental setup (Leão et al, 2015). consecutive microchannels is 176.9 µm.…”

Section: Methodsmentioning

confidence: 99%

“…For those interested on a detailed description of the data regression procedure, the previous paper by Leão et al (2015) is recommended as reference. 1.3…”

Section: Data Reductionmentioning

confidence: 99%

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