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Experimental Methods for Engineers

A marine condenser with exhausted steam as the working fluid is researched in this paper. Constructal designs of the condenser are numerically conducted based on single and multi-objective optimizations, respectively. In the single objective optimization, there is an optimal dimensionless tube diameter leading to the minimum total pumping power required by the condenser. After constructal optimization, the total pumping power is decreased by 42.3%. In addition, with the increase in mass flow rate of the steam and heat transfer area and the decrease in total heat transfer rate, the minimum total pumping power required by the condenser decreases. In the multi-objective optimization, the Pareto optimal set of the entropy generation rate and total pumping power is gained. The optimal results gained by three decision methods in the Pareto optimal set and single objective optimizations are compared by the deviation index. The optimal construct gained by the TOPSIS decision method corresponding to the smallest deviation index is recommended in the optimal design of the condenser. These research ideas can also be used to design other heat transfer devices.

Multi-Objective Constructal Optimization for Marine Condensers

Three-dimensional conjugate heat transfer in a rectangular duct with two discrete flush-mounted heat sources has been studied numerically in the context of cooling of electronic equipments. The Grashof number is fixed as 10 6 and the working fluid is taken as air The effects of the spatial arrangement of heat sources, the thermal conductivity ratio of the bottom plate material to air, and the Reynolds numbers on the overall and local heat transfer in the duct are evaluated. The magnitudes of the conduction and the convection transport are compared for different parametric combinations. Of particular interest are the transverse variation in the flow, temperature and heat transfer, the interaction between the heat sources, and the effects of conjugate transport

Ted-aj03-252 three dimensional conjugate heat transfer in a horizontal channel with discrete heating

Constructal design for the layout of multi-chip module based on thermal-flow-stress coupling calculation

Smart microchannel heat exchanger based on the adaptive deformation effect of shape memory alloys

Constructal design of heat sources with different heat generation rates for the hot spot mitigation

Constructal enhancement of cooling performance of local heating elements with different heat generation rates under free and mixed convection regimes

Effect of heaters’ clearance on mixed convection cooling performance in a dicretely heated horizontal duct

This study aims to numerically investigate the influence of surface radiation on jet impingement cooling of a two-dimensional concave surface with a slot nozzle. For a constant value of the aspect ratio (h/2W=4.0), varying values of Reynolds number (Re=1185, 2370, 3555 and 4740) and surface emissivity (ε=0.05, 0.45 and 0.90) are tested. The cases with or without radiation are comparatively examined. The results are presented as the local temperature variations as well as the variations of the convective and radiative Nusselt numbers, Nusselt number ratio and total Nusselt number. It is disclosed that the increase in surface emissivity improves the overall cooling performance. 

Effect of surface radiation on jet impingement cooling of a concave surface

This study aims to investigate the role of jet-to-cross flow velocity ratio on convective heat transfer and flow characteristics in a channel with discrete heating modules simulating electronic components. Three-dimensional numerical simulations are performed using the finite volume method. The findings obtained for different velocity ratios of the jet-to-crossflow are compared with the reference case (crossflow solely). While keeping the crossflow velocity and the crossflow Reynolds number (Rec=5000) constant, numerical calculations are performed for six different velocity ratios (Ur=1.0,2.0,4.0,6.0,8.0 and 10.0). The focus is on the role of the velocity ratio (Ur) on the mean Nusselt number (Num) on the modules’ surfaces, the Nusselt number ratio (Nur), the friction coefficient ratio (fr) obtained throughout the channel and the thermal enhancement factor (TEF). As a result of the study, it is revealed that the momentum of jet flow becomes dominant over crossflow, the influence of jet flow on convective heat transfer increases, and the thermal enhancement factor increases depending on the increase in jet-to-cross flow velocity ratio. 

Soner Birinci

Papers

Constructal design of heat sources with different heat generation rates for the hot spot mitigation

Constructal enhancement of cooling performance of local heating elements with different heat generation rates under free and mixed convection regimes

Effect of heaters’ clearance on mixed convection cooling performance in a dicretely heated horizontal duct

Effect of surface radiation on jet impingement cooling of a concave surface

The Role of Jet-to-Crossflow Velocity Ratio on Convective Heat Transfer Enhancement in the Cooling of Discrete Heating Modules