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AbstractKeywordsNomenclature1. Introduction2. Experimental apparatus3. Data reduction4. Results and discussion5. ConclusionConflict of interestAcknowledgmentsReferences

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DOI: 10.1016/j.ijheatmasstransfer.2014.08.022

International Journal of Heat and MassTransfer

Volume 79, December 2014, Pages 269–278

Heat transfer coefficient calculated using a linear pressure gradientHeat transfer coefficient calculated using a linear pressure gradientHeat transfer coefficient calculated using a linear pressure gradientHeat transfer coefficient calculated using a linear pressure gradientassumption and measurement for flow boiling in microchannelsassumption and measurement for flow boiling in microchannelsassumption and measurement for flow boiling in microchannelsassumption and measurement for flow boiling in microchannelsM. Mirmanto

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AbstractTo obtain local flow boiling heat transfer coefficients, some studies used a linear pressure gradient method.In this study, this method is compared with a pressure gradient measurement method. The measurementwas carried out for flow boiling of de-ionized water in single horizontal microchannels. Three single

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microchannels with widths of 0.5 mm, 1 mm and 1.71 mm and a depth of 0.39 mm, giving hydraulicdiameters of 0.438 mm, 0.561 mm and 0.635 mm, were tested. The channel length was the same, 62 mm.The nominal mass flux used was 800 kg/m2 s and heat fluxes ranging from 222 to 685 kW/m2 were applied.An inlet fluid temperature of 98 °C and an inlet pressure of 125 kPa (abs) corresponding to an inletsubcooling of 7 K, were maintained at the channel entrance. The trends of heat transfer coefficientdecrease with quality at a fixed heat flux and mass flux along the channel. However, the heat transfermechanism was dominated by nucleate boiling for the 0.561 mm and 0.635 mm channels indicated by theincreased local heat transfer coefficient with heat flux, while for the 0.438 mm channel, it was dominated byconvective boiling because there was no effect of heat flux on the local heat transfer coefficient. Local heattransfer coefficients determined using the two methods were found to be significantly different, especiallyat high heat fluxes. When the Φ is less than 9 W/m2 Pa for the 0.438 mm channel, less than 11 W/m2 Pa forthe 0.561 mm channel and less than 16 W/m2 Pa for the 0.635 mm channel, the linear pressure distributionmay be used with caution.

KeywordsFlow boiling; Microchannel; Pressure gradient; Heat transfer coefficient

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