Numerical Investigation of Thermohydraulic Performance in Laminar Flow through Microchannels Equipped with Longitudinal Vortex Generators

Vortex generators (VGs) are widely employed to enhance heat transfer in channel flows by inducing vortices, with their performance strongly influenced by geometric parameters and flow conditions. This study numerically investigates the thermohydraulic performance of laminar flow (Re = ۲۰۰–۱۲۰۰) in a rectangular microchannel (H = ۰.۲۶ mm) equipped with longitudinal vortex generators (LVGs) of reduced height (۰.۷۵H). The objective is to assess the impact of reduced LVG height on pressure loss and heat transfer enhancement, using water as the working fluid. Numerical simulations were validated against existing data, with deviations remaining below ۱۰%, and were subsequently conducted for three LVG orientation angles (۳۰°, ۱۳۵°, and ۱۵۰°). The results indicate that at Re = ۱۲۰۰, the LVGs increased the friction factor by up to ۶% for ۳۰° and ۱۵۰° and ۸% for ۱۳۵°, while increasing the Nusselt number by up to ۱۸% for ۳۰° and ۱۵۰° and ۲۴% for ۱۳۵°. The highest thermal performance factor of ۱.۲۱ was achieved at the ۱۳۵° orientation for Re=۱۲۰۰, identifying it as the optimal configuration among those tested.

کلیدواژه ها:

Fluid flow ، Heat transfer ، Laminar flow ، Microchannels ، Vortex generators