## THERMAL SCIENCE

International Scientific Journal

### GENETIC ALGORITHM-BASED HEAT TRANSFER ENHANCEMENT TECHNIQUE OF A PROTRUDED MICRO-CHANNEL

**ABSTRACT**

As an innovative type of passive flow control structure, the protrusion exhibits great potential for heat transfer enhancement. In this paper, genetic algorithm is used for the dimensional optimization of a protruded micro-channel. The protruded micro-channel is studied at four mass-flow rates. In all the cases, thermal performance is selected as the objective function that represents both heat transfer and flow friction. The radius of the protrusion and the distance are selected as the two optimized parameters, and their ranges are decided by physical topologies. The objective function thermal performance is calculated by an auto-CFD batch program. The results shows that there are two peaks of thermal performance values when R and δ change in the cases with flow rates equaling 4 ⋅ 10–5 kg/s and 6 ⋅ 10–5 kg/s, while at the other two flow rates, the thermal performance values increase monotonously. The global optimal solutions for the four flow rates and two local optimal solutions are given in this research, and it is helpful to choose the best design variables to achieve the highest thermal performance. It also can be found that at all the different flow rates, the optimized shape of micro-channel has the same point that (R-δ) is nearly 45 μm in the studied ranges of optimized parameters.

**KEYWORDS**

PAPER SUBMITTED: 2018-05-17

PAPER REVISED: 2018-08-23

PAPER ACCEPTED: 2018-11-06

PUBLISHED ONLINE: 2019-03-31

**THERMAL SCIENCE** YEAR

**2019**, VOLUME

**23**, ISSUE

**Supplement 3**, PAGES [S727 - S735]

- Chen Q., Wang M., Pan N., Guo Z.Y., Optimization principles for convective heat transfer, Energy, 34 (2009), 9, pp. 1199-1206
- Shen H., Jin X., Zhang F., Xie G., Sunden B., Yan H., Computational optimization of counter-flow double-layered microchannel heat sinks subjected to thermal resistance and pumping power, Applied Thermal Engineering, 121 (2017), Jul. 5, pp.180-189
- Xie G., Shen H., Wang C.C., Parametric study on thermal performance of microchannel heat sinks with internal vertical Y-shaped bifurcations, International Journal of Heat & Mass Transfer, 90 (2015), Nov. 4, pp. 948-958
- Li P., Xie Y., Zhang D., Laminar flow and forced convective heat transfer of shear-thinning power-law fluids in dimpled and protruded microchannels, International Journal of Heat & Mass Transfer, 99 (2016), 5, pp. 372-382
- Zhang D., Zheng L., Xie G., Xie Y., An Experimental Study on Heat Transfer Enhancement of Non-Newtonian Fluid in a Rectangular Channel With Dimples/Protrusions, Journal of Electronic Packaging, 136 (2014), 2, pp. 021005-021005-021010
- Naphon P., Kornkumjayrit K., Numerical analysis on the fluid flow and heat transfer in the channel with V-shaped wavy lower plate ☆, International Communications in Heat & Mass Transfer, 35 (2008), 7, pp. 839-843
- Liu M., Liu D., Xu S., Chen Y., Experimental study on liquid flow and heat transfer in micro square pin fin heat sink, International Journal of Heat & Mass Transfer, 54 (2011), 25-26, pp. 5602-5611
- Yang Y.T., Peng H.S., Numerical study of pin-fin heat sink with un-uniform fin height design, International Journal of Heat & Mass Transfer, 51 (2008), 19-20, pp. 4788-4796
- Roth R., Lenk G., Cobry K., Woias P., Heat transfer in freestanding microchannels with in-line and staggered pin fin structures with clearance, International Journal of Heat & Mass Transfer, 67 (2013), Dec. 4, pp. 1-15
- Yang K., Zhang D., Xie Y., Xie G., Heat Transfer and Entropy Generation of Non-Newtonian Laminar Flow in Microchannels with Four Flow Control Structures, Entropy, 18 (2016), 8, pp. 302
- Rao R.V., More K.C., Taler J., Ocłoń P., Dimensional optimization of a micro-channel heat sink using Jaya algorithm, Applied Thermal Engineering, 103 (2016), Jun. 25, pp. 572-582
- Rao R.V., Savsani V.J., Vakharia D.P., Teaching-learning-based optimization: A novel method for constrained mechanical design optimization problems, Computer-Aided Design, 43 (2011), 3, pp. 303-315
- Xie G., Song Y., Sundã©N B., Computational optimization of the internal cooling passages of a guide vane by a gradient-based algorithm, Numerical Heat Transfer, 69 (2016), 12, pp. 1311-1331
- Lin L., Chen Y.Y., Zhang X.X., Wang X.D., Optimization of geometry and flow rate distribution for double-layer microchannel heat sink, International Journal of Thermal Sciences, 78 (2014), Apr. 9,pp. 158-168
- Li Y., Wang X., Yuan S., Tan S.K., Flow development in curved rectangular ducts with continuously varying curvature, Experimental Thermal & Fluid Science, 75 (2016), Jul. 12, pp. 1-15
- Liu J., Xie G., Simon T.W., Turbulent flow and heat transfer enhancement in rectangular channels with novel cylindrical grooves, International Journal of Heat & Mass Transfer, 81 (2015), Feb, 6, pp. 563-577
- Yang Y.T., Tang H.W., Ding W.P., Optimization design of micro-channel heat sink using nanofluid by numerical simulation coupled with genetic algorithm ☆, International Communications in Heat &Mass Transfer, 72 (2016), Mar. 7, pp. 29-38
- Wang X.D., An B., Lin L., Lee D.J., Inverse geometric optimization for geometry of nanofluid-cooled microchannel heat sink, Applied Thermal Engineering, 55 (2013), 1-2, pp. 87-94
- Zhang D., Zheng L., Xie G., Xie Y., An Experimental Study on Heat Transfer Enhancement of Non-Newtonian Fluid in a Rectangular Channel With Dimples/Protrusions, Journal of Electronic Packaging, 136 (2014), Apr. 29, pp. 682-694
- Liu J., Song Y., Xie G., Sunden B., Numerical modeling flow and heat transfer in dimpled cooling channels with secondary hemispherical protrusions, Energy, 79 (2014), Jan.1, pp. 1-19
- Xie G., Song Y., Simon T.W., Turbulent flow characteristics and heat transfer enhancement in a rectangular channel with elliptical cylinders and protrusions of various heights, Numerical Heat Transfer Applications, 72 (2017), Oct. 17, pp. 1-16
- Hur D S, Lee W D, An S W, et al. A Numerical Study on Flow Control Structure of a New-Type Submerged Breakwater,Journal of Korean Society of Coastal and Ocean Engineers, 22 (2010), 3, pp. 181-190
- Abramson M.A., Mixed Variable Optimization of a Load-Bearing Thermal Insulation System Using a Filter Pattern Search Algorithm, Optimization & Engineering, 5 (2004), 2, pp. 157-177
- Wetter M., Polak E., Building design optimization using a convergent pattern search algorithm with adaptive precision simulations, Energy & Buildings, 37 (2005), 6, pp. 603-612