Evaporation, Condensation and Heat Transfer

Dear Colleagues,

Improvements to the energy utilization efficiency in various engineering systems are receiving ever-increasing worldwide attention in light of their importance in reducing the release of CO₂(g), a global weather-warming gas, during the burning of fossil fuels to produce the necessary energy. Recently, the use of variable-frequency, instead of ON/OFF, compressors in various air conditioning and refrigeration systems to meet the temporally changing thermal loads has been found to significantly augment the energy efficiencies of these systems. It is important to note that in these systems, the refrigerant flow rate varies with time, and the systems are subjected to changing thermal loads. How this time-dependent refrigerant flow rate and heat flux affect the characteristics of boiling and condensation processes in the refrigeration cycles employed in these air-conditioning and refrigeration systems remains largely unexplored. In cooling future ultra-high-component density electronic devices, methods based on phase change heat transfer are often considered. Moreover, the power dissipated in these devices is also time-dependent, hence the cooling load. The associated time-dependent two-phase flow and heat transfer processes in electronics cooling are also poorly understood.

Dr. Chien-An Chen
Dr. Zhao Tian
Guest Editors

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