A Comprehensive Study of Conjugate Heat Transfer During Free Liquid Jet Impingement on a Rotating Disk

Abstract

The aim of this computational study is to characterize convective heat transfer for a free liquid jet impinging on a rotating and uniformly heated solid disk of finite thickness and radius. Calculations are done for a number of disk materials and working fluids covering a range of Reynolds number (445-1,800), Ekman number (2.21 3 10 À5 -2.65 3 10 À4 ), nozzleto-target spacing (b ¼ 0.55-5.0), disk thicknesses-to-nozzle diameter ratio (0.167-1.67), disk-to-nozzle diameter ratio (2.11-6.33), Prandtl number (1.29-124.44), and solidto-fluid thermal conductivity ratio (36.91-2222). A generalized correlation for average Nusselt number is developed from numerical results. The simulation results compare reasonably well with available experimental data.

Flow Characteristics of Circular Liquid Jet Impinging on a Moving Surface Covered with a Water Film

“…Rahman et al 12,13) numerically characterized the convective heat transfer of a free liquid jet impinging on a rotating, uniformly heated solid disk with finite thickness and radius. Chen et al 14) studied the heat transfer between a circular impinging jet and a moving metal plate at temperatures above and below the boiling point of water by means of experiments and numerical simulations.…”

Calculation of jet’s inlet temperature for plate temperature control in an impinging jet cooling problem

“…(22) will be equal to zero at the final iteration step. Computational experience has shown that it is advisable to use the discrepancy principle [19] for terminating the iteration process in the conjugate gradient method, i.e., it is assumed that the residuals for the temperatures may be approximated by T s (x m , y m ) À Y(x m , y m ) ffi r, where r is the standard deviation of the temperature measurements, which is assumed to be a constant. Substituting the approximation T s (x m , y m ) À Y(x m , y m ) ffi r into Eq.…”

“…Therefore, the direct problem is a forcedconvection heat transfer problem, and the steady two-dimensional governing equations and boundary conditions can be written as [19]: Navier-Stokes equations:…”

Transient Conjugate Heat Transfer During Free Liquid Jet Impingement on a Rotating Solid Disk

“…Computations were performed using a two-dimensional axisymmetric Eulerian mesh while the free surface was calculated with the volume of fluid method. Rahman and Lallave [21] numerically studied the convective heat transfer performance of a free liquid jet impinging on a rotating and uniformly heated plane solid disk of finite thickness and radius. A generalized average Nusselt number correlation was developed from numerical results.…”