Effect of tip clearance on the heat transfer and pressure drop performance in the micro-reactor with micro-pin–fin arrays at low Reynolds number

Mei, Deqing; Lou, Xinyang; Qian, Miao; Yao, Zhehe; Liang, Lin; Chen, Zichen

doi:10.1016/j.ijheatmasstransfer.2013.11.060

Cited by 74 publications

(28 citation statements)

References 23 publications

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“…Uncertainties in parameters are estimated by using the root-sum-square method of Moffat [29]. The experimental data obtained herein revealed that the uncertainties in the Reynolds number and the Nusselt number (as shown in Equations (10), (12) and (14)) were ±5.91% and ±6.83%, respectively. Figure 6 shows the flow visualizations of 3 × 3 pin-fin heat-sink array in a rectangular channel in the A-A and B-B sectional views of laser sheet (top-view surface tangential to inside of heat-sink array).…”

Section: Experimental Methodsmentioning

confidence: 81%

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Numerical Simulation of Laminar Forced Convection of Pin-Fin Heat-Sink Array in a Channel by Using Porous Approach

Jeng

Tzeng

2015

Applied Sciences

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This work used a porous approach model to numerically investigate the fluid flow and heat transfer characteristics of the pin-fin heat-sink array in a rectangular channel with in-line arrangement. The air flow through the channel was laminar. The pin-fin heat sinks with various porosities and pin-fin numbers were employed. The relative center-to-center longitudinal and transverse distances between adjacent heat sinks were changed. The results indicate that the Nusselt number of various heat-sink arrays increased with decreasing the relative center-to-center transverse distance, but not varied with the relative center-to-center longitudinal distance. For the typical pin-fin heat-sink arrays, the Nusselt number changed slightly for the heat sinks with 0.358-0.556 porosity, but increased by 11.7%-24.8% when the porosity increased from 0.556 to 0.750, and then dropped obviously when the porosity exceeded 0.750. Increasing the number of pin fins continuously could increase Nusselt number. However, when the number of pin fins was large, the Nusselt number increased with the number of pin fins slowly. The present numerical simulation has been validated by the typical experiment. Finally, a semi-empirical correlation of Nusselt number for each heat sink in the heat-sink array was proposed.

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Section: Experimental Methodsmentioning

confidence: 81%

“…The issue about the heat transfer characteristics of finned heat sinks without [1][2][3][4][5][6] or with bypass effect [7][8][9][10][11][12] attracts wide attention continuously. This work is to discuss putting the pin-fin heat-sink array into a rectangular channel in in-line arrangement with laminar side-bypass effect.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Laminar Forced Convection of Pin-Fin Heat-Sink Array in a Channel by Using Porous Approach

Jeng

Tzeng

2015

Applied Sciences

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“…Then the thickness of boundary layer in micro pin-fins channel is calculated by averaging the values at all of the points. For the micro-pin-fin array with H/D = 1.5 at Q = 50 W and Re = 200, the boundary layer thickness on cross section 3 (20) …”

Section: Resultsmentioning

confidence: 99%

“…The measurements showed that a significant portion of the fluid flowed below the pin fins in the clearance bypass region, leading to heat transfer enhancement over un-finned reference geometry only for small clearance to diameter ratios. Mei et al [20] numerically investigated the effect of tip clearance on the performance of heat transfer and pressure drop at low Re number, and found that the heat transfer and pressure drop performance in the case of low Re was quite sensitive to the tip clearance, and the introduced tip clearance could enhance the heat transfer and reduce the pressure drop effectively.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2015

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“…Mei et al [22] investigated by computational fluid dynamics (CFD) the effect of tip clearance on the performance of the heat transfer and pressure drop at low Reynolds number of micro-reactors with micro-pin-fin arrays (MPFAR). They found that the performance is quite sensitive to the tip clearance, and the introduced tip clearance can enhance the heat transfer and reduce the pressure drop effectively [23].…”

Section: Introductionmentioning

confidence: 99%

Studying the performance of solid/perforated pin-fin heat sinks using entropy generation minimization

Elsayed

Mesalhy

2014

Heat Mass Transfer

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Heat transfer and pressure drop characteristics of a set of pin-fins with uniform heat flux were investigated experimentally and numerically. Test set-up was designed to assess the effects of mass flow rate, fin height, and fin density on convection heat transfer and pressure drop. In the numerical investigation, the flow field of various design parameters of the heat sink was simulated. It was found that heat sinks having fin heights of 20 and 30 mm operated at a lower Reynolds number reached minimum value for thermal resistance when the fin density 10 9 10. Which means it is the optimum number of fins for this case. Also, friction factor increased with a decrease in the bypass flow area or inter-fin distance spacing and using perforated fins reduced the pressure losses and thermal resistance for all studied cases. List of symbolsD hd Duct hydraulic diameter (m) E Total energy per unit mass (J/kg) H Fin height (m) L Heat sink foot print length (m) N Number of fins P 1 Channel inlet pressure (N/m 2 ) P L Non-dimensional pitch = (a ? b)/a Q Heat input (W) R th Total thermal resistance (K/W) Re D Reynolds number using D h V d Duct velocity (m/s) S g Entropy generation minimization h Heat transfer coefficient (W/m 2 K) b Fin spacing (m) a Fin side thickness (m) y ?Dimensionless wall distanceGreek symbols e Turbulent dissipation rate (m 2 /s 5 ) lAbsolute viscosity (Pa s) bOpen area ratio (%) qDensity (kg/m 5 ) DP Pressure drop across heat sink (N/m 2 )

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Effect of tip clearance on the heat transfer and pressure drop performance in the micro-reactor with micro-pin–fin arrays at low Reynolds number

Cited by 74 publications

References 23 publications

Numerical Simulation of Laminar Forced Convection of Pin-Fin Heat-Sink Array in a Channel by Using Porous Approach

Numerical Simulation of Laminar Forced Convection of Pin-Fin Heat-Sink Array in a Channel by Using Porous Approach

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

Studying the performance of solid/perforated pin-fin heat sinks using entropy generation minimization

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