Mixed convection heat transfer from a vertical flat plate subjected to periodic oscillations

Abstract

In this study, effects on mixed convection heat transfer of oscillation parameters on a vertical flat plate surface subjected to constant heat flux are experimentally and numerically investigated. The experimental setup includes a hanger-pulley system installed above a transparent enclosure contain a moving experimental model, flywheel-motor assembly generating the oscillating movement of the experimental model, power supply, and datalogger. The experimental model comprises two copper plates with attached thermocouples and Kapton heaters placed between the plates. In the study, heat flux applied to surface of the plates (q″), the Womersley number (Wo) and dimensionless oscillation amplitude (A o ) are varied. The effects of these parameters on the heat transfer performance are analyzed. This study is numerically solved using a control-volume based Computational Fluid Dynamics solver based on experimental data. The numerical results are compared with the experimental results and open literature. Instantaneous velocity and temperature profiles on the plate are obtained to explain the heat transfer mechanism. According to the numerical and experimental results, heat transfer performance is significantly a ffected by os cillation pa rameters an d he at flu x app lied to the plate surface. The m ixed c onvection h eat t ransfer i ncreases w ith t he i ncrease i n o scillation parameters for all tested heat fluxes. The obtained results are presented as a function of dimensionless numbers.

Review on Nanofluids: Preparation, Properties, Stability, and Thermal Performance Augmentation in Heat Transfer Applications

“…They disclosed that Re substantially influenced the THP and the nanofluid ϕ; additionally, they attained the highest THP in the laminar regime due to minimal Δp. kcay et al 221 found that while there is no improvement in THP at low frequency and intensity, a specific frequency exists that maximizes THP. By optimizing THP at high intensity and a specific frequency (W o = 10), pulsating flow greatly enhanced HT, despite increasing f. The researchers noted that as the frequency exceeds the critical value (W o = 15), the enhancement in THP diminishes due to reduced HT efficiency and higher f losses.…”

Modeling the Effects of Horizontal Transverse Vibrations on the Thermal Behavior and the Ampacity of Rectangular Bus Bars

“…The state-of-the-art references directly related to bus bars addressed the following research gaps: finite element method-(FEM-) based electrodynamic modeling of bus bars carrying high currents [11,12]; FEM-based modeling of bus bars in terms of coupling electromagnetic and thermal phenomena with fluid flow [13]; and vibration response of a bus bar enclosure considering the effect of a strong electric field [14]. In a broader context, these state-of-the-art studies have also closed research gaps, such as the effect of internal plate vibrations on heat transfer in a dryer [15]; visualization of a vibrating plate in a boiling bubble resonator [16]; mixed convection from a vertical plate subjected to periodic oscillations [17]; as well as the effect of vibrations on the phenomena of heat transfer and flow along heat exchange surfaces [18]. Within this broader context, the effects of square and sinusoidal wave-shaped vibrations on forced convection from a heat sink [19] and the modeling of the thermal behavior of different vibrating blades [20] were also addressed.…”

Mixed convective flow of heat and mass transfer of nanofluids over a static wedge with convective boundary conditions

“…Labropulu et al [29] analyzed the impact of unsteadiness parameters on the helper liquid stream to the stagnation point. Sandeep et al [30] researched the impacts of synthetic responses and prompted attractive fields in Jeffrey's nanofluid in the stagnation point stream [30] Recently, the authors [38][39][40][41] Considered the progression of heat transfer in various kind of situation such as stagnation point in a Jeffrey liquid on a greased up surface, vertical flat plate, louvered strip by using Graphene-based nanofluids etc and found it is significant in manufacturing and industrial systems.…”