David, M.P., Miler, J., Steinbrenner, J., Yang, Y., Touzelbaev, M., and Goodson, K.E., 2011, “Hydraulic and Thermal Characteristics of a Vapor Venting Two-phase Microchannel Heat Exchanger,” International Journal of Heat and Mass Transfer, Vol. 54, pp. 5504-5516.



In the present work we design, model and experimentally characterize a two-phase vapor venting parallel microchannel heat exchanger capped with a 220 nm pore, hydrophobic PTFE membrane that vents the vapor phase into separate vapor transport channels. We compare the performances of a traditional nonventing heat exchanger and the vapor-separating version operating at heat fluxes of up to 820 kW/m2 and water mass fluxes of between 102 and 420 kg/s m2. We find 60% improvement in the normalized pressure drop and up to 4.4 C reduction in the average substrate temperature between the control and vapor venting device under similar operating conditions.