TY  - JOUR
TI  - THE EFFECT OF COOLING ON MECHANICAL AND THERMAL STRESSES IN VASCULAR STRUCTURES
AB  - Here, we show how the vascular channel configuration and its shape affect the mechanical strength which issimultaneously subjected to heating and mechanical load. The material properties were defined as functions oftemperature. The effect of channel cross-section on the coolant mass flow rate, peak temperature and peak stressesare documented. The results show that the resistances to flow of stresses and fluid is minimum with the circularchannels while the resistance to the heat flow is the smallest with semi-circular channels. In addition, morphingthe vascular design provides almost the smallest resistance to the heat flow with circular channels (0.3% differencein the peak temperature). This shows that even the convective resistances are the smallest with circular-crosssection, overall thermal resistance is smaller in semi-circular design for the fixed fluid volume. The peak stress issmaller with hybrid design than the parallel designs for the entire pressure drop range. In addition, the effects ofmechanical load, heating rate and reference temperature on the stress distribution are also documented.Furthermore, the thermal and mechanical stresses are also documented separately, and then compared with thecoupled solution cases. The chief result of this paper is that for a coupled system minimizing only one of theresistance terms is not sufficient, all the resistances considered simultaneously in order to uncover the bestperforming design. In coupled solutions, we documented the simulation results with temperature dependentmaterial properties and the resistances to the heat and fluid flow is affected by the mechanical deformations. Inaddition, the results show that the designs should be free to vary, the unexpected designs can be the best performingdesigns for the given parameters and constraints. Therefore, the design parameters based on the experience doesnot always yield the best performing designs as the objectives and constraints vary.
AU  - CETKİN, E.
PY  - 2018
JO  - Journal of Thermal Engineering
VL  - 4
IS  - 2
SN  - 2148-7847
SP  - 1855
EP  - 1866
DB  - TRDizin
UR  - http://search/yayin/detay/304787
ER  -