Radiation Effect on Constructal Design Analysis of a T-Y-Shaped Assembly of Fins

Abstract

In the actual design circumstances, the radiation effect on the cooling performance of the extended surfaces must be taken into consideration. The central goal of this paper is to design the constructal architecture of a T-Y shaped assembly of fins by incorporating the thermal radiation with convection heat transfer. Our motivation in selecting a T-Y shaped assembly of fins is that the so-called assembly is of more cooling performance among the other shapes according to the literature. The temperature field and the peak temperature (hot spot) are calculated from a numerical approach based on finite element method. The peak temperature is minimized by manipulating the geometry of the assembly regarding the constraints of space and materials. A comparative study is executed among the present work and the published work. The comparison revealed that although the optimized geometry is approximately independent of the heat transfer mechanism, the hot spot temperature can be affected when the finned surfaces are exposed to thermal radiation in addition to convection. This issue is more pronounced when the emissivity of the finned surfaces is higher in comparison with the convection heat transfer coefficient.

Effect of operating parameters on the transient behavior of gravity-assisted heat-pipe using radio-chemically prepared Al 2 O 3 nano-fluid

“…102 Bello-Ochende and Bejan [9] studied the optimal spacing 103 between plates in a heat-generating stack of parallel plates con-104 strained with a fixed volume and presented a single formula for 105 optimum spacing between plates in a pure natural, pure forced, 106 and mixed convection flow system. The design and configuration 107 of fins is another area where constructal design was applied for 108 it [3,10] When heat is applied to the outer surface of the base of the tube 122 (evaporator), the working fluid inside the tube boils and evapo-123 rates due to absorbing an amount of heat equivalent to its latent 124 heat of vaporization. The resulting vapor rises due to buoyancy 125 effects through the tube at the speed of the moving molecules 126 seeking a cooler location (condenser) where it rejects its latent 127 heat, returning into its initial liquid state.…”

Constructal entransy dissipation rate minimization for helm-shaped fin with inner heat sources

“…Constructal theory [1-10] is widely used in the performance optimizations of various transfer systems, and this theory is also introduced into the optimal design of the fin [11][12][13][14][15][16][17][18][19][20].…”

“…For the traditional fins, the heat flows come from their roots [11][12][13][14][15][16][17][18][19]. The heat can also be generated from the inner of a fin, and some scholars have shown great interests in the performance analyses and optimizations of this kind of fins [21][22][23][24][25][26].…”

“…[11][12][13][14][15][16][17][18][19][20] can not reflect the models' global heat transfer performances (GHTPs). Considering this situation, Guo et al [27,28] proposed a new physical quantity, "entransy" and entransy dissipation extremum principle.…”

The role of housing design in a multiple fans system with a piezoelectric actuator

“…Except the convective effect, the radiative effect can also influence the thermal performance of the system. The radiative effect on the T-Y shaped assembly of fins was investigated by the numerical approach [11]. Many other researchers contributed novel methods to assist engineers in the design of cooling systems.…”