Laminar flow and heat transfer characteristics of interrupted microchannel heat sink with ribs in the transverse microchambers

Abstract

The paper is focused on the investigation of the laminar flow and heat transfer characteristics in the interrupted microchannel heat sink with ribs in the transverse microchambers. A three-dimensional model based on finite volume approach and SIMPLEC algorithm is performed considering entrance effect, conjugate heat transfer, viscous heating and temperature-dependent thermo-physical properties. Five different rib configurations are considered, including rectangular, backward triangular, diamond, forward triangular and ellipsoidal. The present study firstly examines the effect of such ribs on velocity contour, pressure distribution and temperature distribution, further the local pressure drop and heat transfer characteristics in such microchannel heat sinks. Result shows that the ribs in the transverse microchambers can effectively prevent the decline of local heat transfer coefficient along the flow direction. Secondly, the average friction factor and Nusselt number for such microchannel heat sinks have been studied. Results show that for Reynolds number ranging

Parametric Investigation on a Micro-Array Heat Sink with Staggered Trapezoidal Bumps

“…The reasons were: 1) the cooling area doubled because the bumps on both the top and bottom substrates were connected together when b/c > 1.0; 2) the asymmetrical pair-vortex due to the asymmetrical geometry played a special role, i.e., Figure 9 shows the preferential value was about b/c = 1.25. The reasons were: (1) the cooling area doubled because the bumps on both the top and bottom substrates were connected together when b/c > 1.0; (2) the asymmetrical pair-vortex due to the asymmetrical geometry played a special role, i.e., the larger vortex in the pair-vortex could compel the smaller one to the center ( Figure 10c); (3) the connected bumps (near the top side of a trapezoidal bump, Figure 10b,c) acted as the wall of the microchannel in the MCHS, and the fluids in other regions (fore and rear rake of the trapezoid, Figure 10a,d) were interconnected, as described in Chai et al [11]; and (4) conversely, the greater the bump width, the greater the pressure drop, and subsequently, the greater the pump power. In a word, 1.0 < b/c < 1.25 was the range of preferential values.…”

“…the larger vortex in the pair-vortex could compel the smaller one to the center ( Figure 10c); 3) the connected bumps (near the top side of a trapezoidal bump, Figure 10b,c) acted as the wall of the microchannel in the MCHS, and the fluids in other regions (fore and rear rake of the trapezoid, Figure 10a,d) were interconnected, as described in Chai et al [11]; and 4) conversely, the greater the bump width, the greater the pressure drop, and subsequently, the greater the pump power. In a word, 1.0 < b/c < 1.25 was the range of preferential values.…”

“…MCHSs were proposed initially in the 1980s by Tuckeman [1] to take the place of the traditional heat exchanger for the cooling requirement of an integrated circuit (IC). In order to elevate the heat transfer performance, the structures and parameters of an MCHS, e.g., the shape of the microchannel [2,3], the width:depth ratio of the rectangular microchannel [4,5], the complex manifold geometries [6,7], the potential double/multilayers MCHS [8][9][10], the interrupted microchannel with various ribs [11,12], and so on, have been investigated. The most representative examples are as follows.…”

Numerical investigation for optimizing segmented micro-channel heat sink by Taguchi-Grey method

“…On top of that, flow disruption in a wavy channel promotes vortex creation which aids in coolant mixing and subsequently enhances the microchannel heat sink performance. Besides, Chai et al have conducted a series of numerical analysis to investigate the flow and heat transfer characteristics of an interrupted microchannel heat sink by installing different configurations of ribs in the transverse microchambers [9]. Based on the simulation results obtained, it is demonstrated that the heat transfer performance of an interrupted micro-channel heat sink is comparatively greater than that of a straight-channel heat sink owing to the enhanced heat transfer coefficient through fluid mixing and re-initialization of the thermal boundary layer in the microchannel heat sink.…”

A review on heat transfer and hydrodynamic characteristics of nano/microencapsulated phase change slurry (N/MPCS) in mini/microchannel heat sinks

“…In order to further enhance the cooling ability of the currently available mini/microchannel heat sinks, researchers have investigated the cooling system configuration [3,4,5], working fluids [6,7,8] and other relevant parameters [9][10][11][12]. Among these methods, the mini/microchannel heat sink with N/MPCS as working fluid has attracted the researchers' attentions, because it combines the advantages of both mini/microchannel and N/MPCS.…”