Simulation Research on Flow Boiling and Heat Transfer of Micro-channel for Electronic Cooling

Abstract

Micro-channel heat exchanger is a popular device for the electronic cooling. Heat transfer of flow boiling in micro-channel is a research hotspot. For the convenience of the theoretical research on micro-channel, a high efficiency simulation model on flow boiling and heat transfer of micro-channel was established. In the simulation research, the influence rules of operating conditions and thermal properties of refrigerants (working fluids) on the flow boiling were studied; the distribution rules along flow direction of characteristic parameters such as vapor quality, Heat Transfer Coefficient (HTC), pressure drop and bottom wall temperature of micro-channel T w were analyzed; the key factors on the distribution of characteristic parameters were proposed. The characteristic parameters based on the refrigerants R134a and R1234ze(E) in micro-channel were compared and researched. According to the simulation results, HTC and pressure drop of R134a are larger and smaller than those of R1234ze(E) respectively, the uniformities of HTC and T w of R134a are all better than those of R1234ze(E) respectively.

Simulación de un micro-evaporador para un micro-tubo horizontal circular de 1-mm

“…Magnini & Matar [13] have optimized the design of micro-evaporators via numerical simulations. Yuan et al [22] have performed a steady simulation model based on one-dimensional flow direction of flow boiling in micro-channel for refrigerants R134a and R1234ze(E), being to highlight that the local heat transfer coefficient: i) of R1234ze(E) is lower than that of R134a, and ii) decreases (in the two-phase region) along the flow direction, which indicates that the nuclear boiling is dominant. Majumdar et al [23] have simulated, by solving mass, momentum and energy conservation equations, a configuration of fluid flowing in a vertical heated tube for water and for liquid nitrogen, comparing the experimental data with numerical predictions based on four different correlations, finding that, for the case of boiling water, the predictions using the correlations agreed with the experimental results, while there are large discrepancies for the case of boiling hydrogen.…”