Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

HEAT TRANSFER PERFORMANCE EVALUATION OF CORRUGATED MICROCHANNEL HEAT SINKS

Get access (open in a dialog) DOI: 10.1615/IHTC16.nmt.022030
pages 6883-6889

Abstrakt

This work numerically investigates the heat transfer performance of micro heat sinks formed with corrugated channels. Laminar flow and conjugate heat transfer characteristics of the heat sinks are compared between corrugated microchannels and straight microchannels. The coolant water velocity distribution showed the development of the secondary flow causes advection mixing. The mixing of the fluid mainly occurs due to change of the flow direction. The pressure distributions illustrate that the wall corners bring about jumps in pressure distribution and the pressure decreases steadily along the corrugated channel. The study results showed that corrugated channels are superior over straight channels from the heat transfer point. However utilizing wavy corrugated walls increased the pressure drop penalty. A thermal enhanced factor is used for the overall performance evaluation of microchannel heat sinks in order to account both the heat transfer enhancement and the friction loss penalties. The present flow and thermal field study covers Reynolds number ranging from 50 to 250 and the sets of sinusoidal wavy channels of phase shifts or phase lags of 0°, 45°, and 90°. The presence of the phase shifts in the wavy corrugated walls has a great impact on the thermal enhanced factor depending on the Reynolds number range. The thermal hydraulic performance of microchannels with phase shift is not better that of conventional straight channels when Re < 150 for the considered cases. For the case of phase shift 0°, thermal hydraulic performance factor has its maximum when Re ranges from 100 to 150.