The Effect of Uneven Heating on the Flow Distribution Between Parallel Microchannels Undergoing Boiling
- 14 October 2021
- journal article
- research article
- Published by ASME International in Journal of Electronic Packaging
- Vol. 143 (4)
- https://doi.org/10.1115/1.4052532
Abstract
As the size, weight, and performance requirements of electronic devices grow increasingly demanding, their packaging has become more compact. As a result of thinning or removing the intermediate heat spreading layers, non-uniform heat generation from the chip-scale and component-level variations may be imposed directly on the attached microchannel heat sink. Despite the important heat transfer performance implications, the effect of uneven heating on the flow distribution in parallel microchannels undergoing boiling has been largely unexplored. In this study, a two-phase flow distribution model is used to investigate the impact of uneven heating on the flow distribution behavior of parallel microchannels undergoing boiling. Under lateral uneven heating (i.e., the channels are each heated to different levels, but the power input is uniform along the length of any given channel), it is found that the flow is significantly more maldistributed compared to the even heating condition. Specifically, the range of total flow rates over which the flow is maldistributed is broader and the maximum severity of flow maldistribution is higher. These trends are assessed as a function of the total input power, degree of uneven heating, and the extent of thermal connectedness between the channels. These model predictions are validated against experiments for a representative case of thermally isolated channels subjected to even heating and extreme lateral uneven heating conditions and show excellent agreement.Keywords
This publication has 18 references indexed in Scilit:
- A novel method of energy efficient hotspot-targeted embedded liquid cooling for electronics: An experimental studyInternational Journal of Heat and Mass Transfer, 2015
- Local measurement of flow boiling heat transfer in an array of non-uniformly heated microchannelsInternational Journal of Heat and Mass Transfer, 2014
- A comparative study of flow boiling heat transfer and pressure drop characteristics in microgap and microchannel heat sink and an evaluation of microgap heat sink for hotspot mitigationInternational Journal of Heat and Mass Transfer, 2013
- Experimental investigation of non-uniform heating effect on flow boiling instabilities in a microchannel-based heat sinkInternational Journal of Thermal Sciences, 2011
- Experimental study on microchannel heat sinks considering mass flow distribution with non-uniform heat flux conditionsInternational Journal of Heat and Mass Transfer, 2010
- Numerical modelling of boiling heat transfer in microchannelsApplied Thermal Engineering, 2009
- A theoretical model for the prediction of the critical heat flux in heated microchannelsInternational Journal of Heat and Mass Transfer, 2008
- Flow rate distribution in evaporating parallel pipes—modeling and experimentalChemical Engineering Science, 2006
- Evaporation in parallel pipes––splitting characteristicsInternational Journal of Multiphase Flow, 2004
- Study on Distribution of Flow Rates and Flow Stabilities in Parallel Long EvaporatorsBulletin of JSME, 1971