Saturated flow boiling heat transfer and pressure drop in silicon microchannel arrays |
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Authors: | Poh-Seng Lee Suresh V Garimella |
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Affiliation: | 1. Department of Mechanical Engineering, University of South Carolina, 300 Main St, Columbia, SC 29208, USA;2. Department of Mechanical, Aerospace & Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th St, Troy, NY 12180, USA;3. School of Mechanical and Power Engineering, Shanghai Jiaotong University, 800 Dong Chuan Rd, Shanghai 200240, China;1. Department of Mechanical & Electrical Engineering, School of Aerospace Engineering, Xiamen University, Xiamen 361005, China;2. Department of Instrumental & Electrical Engineering, School of Aerospace Engineering, Xiamen University, Xiamen 361005, China;1. Key Laboratory of Low-grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education, Chongqing 400044, China;2. Factory 7304, China Aerospace Science and Technology Corporation, Chengdu 610100, China |
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Abstract: | Flow boiling in arrays of parallel microchannels is investigated using a silicon test piece with imbedded discrete heat sources and integrated local temperature sensors. The microchannels considered range in width from 102 μm to 997 μm, with the channel depth being nominally 400 μm in each case. Each test piece has a footprint of 1.27 cm by 1.27 cm with parallel microchannels diced into one surface. Twenty five microsensors integrated into the microchannel heat sinks allow for accurate local temperature measurements over the entire test piece. The experiments are conducted with deionized water which enters the channels in a purely liquid state. Results are presented in terms of temperatures and pressure drop as a function of imposed heat flux. The experimental results allow a critical assessment of the applicability of existing models and correlations in predicting the heat transfer rates and pressure drops in microchannel arrays, and lead to the development of models for predicting the two-phase pressure drop and saturated boiling heat transfer coefficient. |
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