Turbulence

Heat transfer coefficient

Engineering

Heat transfer

Materials science

Reynolds number

Heat transfer enhancement

Heat transfer fluid

Microchannel

Thermodynamics

Physics

Nanotechnology

Thermal

Pressure drop

Rib cage

Structural engineering

Heat sink

Mechanics

Micro heat exchanger

International Journal of Heat and Mass Transfer

Flow and heat transfer characteristics of a microchannel heat sink (MCHS) with truncated ribs (TRs) on the sidewall are studied numerically for Reynolds number ranging from 100 to 1000. Three parameters of the TR configuration -gap height, rib arrangement and rib width - are selected to analyze the effects of rib geometry on the hydrothermal performance. It is found that, either in the staggered cases or parallel cases, the TRs can improve the heat transfer near the truncation gap and decrease largely overall pressure drop. Therefore, the existence of TR can improve the overall thermal performance by reducing the pressure drop penalty without heat transfer loss. As the truncation gap increases, the larger pressure drop penalty can be reduced by increasing the flow area.

Fluid and heat transfer characteristics of microchannel heat sink with truncated rib on sidewall