Optimization of short micro pin fins in minichannels

A PCM-water heat exchanger with polymeric hollow fibres for latent heat thermal energy storage: a parametric study of discharging stage

“…The fluid flow in minichannels is characterized by low Reynolds numbers. A number of correlations for minichannels and microchannels can be found in Tullius et al (2012). It has been shown that the fluid flow and heat transfer in minichannels is in a good agreement with the criteria established for channels of much larger diameters (Herwig and Hausner, 2003;Celata et al, 2006;Dutkowski, 2008).…”

Influence of heating load on heat transfer characteristics in micro-pin-fin arrays

“…The governing equations of the model are: Besides, the variation of thermal physical properties may affect the flow and heat transfer in micro-scale convection, especially at high heat flux, so the change of dynamic viscosity and the thermal conductivity are considered in governing equations, as shown in Eqs. (10)(11)(12)(13). The heat capacity change of working fluid in micro-cylinder-groups is much <1 % with temperature ranging from 10 to 90 °C, and the change of the water density is about 3.04 %.…”

“…It was revealed that end walls played an important role on the total fluidic force acting on the micro pin-fin and on the heat transfer coefficients, and the end wall effects decreased with Re and H/D. Except literatures reported by Koşar et al [9,10] and Peles et al [11], some other researchers contributed to the effect of micro pin-fin shapes, such as Tullius et al [13] who employed a numerical model to investigate the optimization on microstructure geometry and to maximize heat transfer dissipation through convection from a heated surface. Six pin fin shapes-circle, square, triangle, ellipse, diamond and hexagon-were used in a staggered array and attached to the bottom heated surface of a rectangular mini-channel.…”

Vortex distribution and mixed convection of liquid flow across micro-cylinders in a rectangular channel

“…At the same time, high efficient cooling technique in micro and mini spaces are requested due to the increasing power and the compactness of electronic elements. Based on this requirement, micro-cylinder-groups (pin fins) have been paid a lot of attentions in recent years as an efficient cooling structure, and many researchers [1][2][3][4][5][6][7][8][9][10] carried out various investigations on the flow and heat transfer characteristics in this structure.…”

“…It was revealed that end walls played an important role on the total fluidic force acting on the micro pin-fin and on the heat transfer coefficients, and the end wall effects decrease with Re and H/D. It is known that the geometry of pin fins is one of the most important factors on the convective heat transfer characteristics in finned mini-channels, so Tullius et al [5] employed a numerical model to investigate an optimization on microstructure geometry and maximize heat transfer dissipation through convection from a heated surface. Six pin fin shapes-circle, square, triangle, ellipse, diamond and hexagon-were used in a staggered array and attached to the bottom heated surface of a rectangular mini-channel.…”