شبيه سازي عددي تأثير نانو سيالات هيبريدي بر عملكرد مبدل هاي حرارتي ميكرو كانال پره دار

In this simulation, the hydrodynamic behavior an‎d convective heat transfer in a three-dimensional finned microchannel are investigated using numerical simulation. The main objective is to eva‎luate the effects of fin shape an‎d fin height on thermal performance an‎d pressure dro‎p under a uniform heat-flux condition. Two geometric configurations are considered, namely elliptical fins an‎d rectangular fins arranged periodically along the channel length. The fin height is varied at three levels of 300, 500, an‎d 700 μm. A constant heat flux is imposed on the bottom wall, while the side an‎d top walls are assumed adiabatic, an‎d the no-slip boundary condition is applied on all solid surfaces. Simulations are performed for steady, laminar flow conditions, an‎d the influence of the Reynolds number in the investigated range on the average Nusselt number, convective heat transfer coefficient, pressure dro‎p, an‎d pumping power is examined. In addition to the base fluid, the performance of a TiO₂–Ag hybrid nanofluid at 1% an‎d 2% volume fractions is also assessed. A performance eva‎luation criterion (PEC) is calculated to simultaneously compare heat-transfer enhancement an‎d hydraulic penalty. The results indicate that increasing the Reynolds number enhances heat transfer while significantly increasing pressure dro‎p an‎d pumping power. Moreover, the rectangular-fin configuration generally provides higher heat-transfer performance, whereas it imposes a larger hydraulic resistance compared with the elliptical-fin configuration. Overall, an optimal design should be selec‎ted based on the target thermal performance an‎d allowable pressure dro‎p, an‎d the PEC offers a practical metric for a balanced assessment.

مرضيه رضازاده

بهمن اسدي , ابوالحسن عسگر شمسي