Heat transfer and fluid flow of benard-cell convection in rectangular container with free surface sensed by infrared thermography

Abstract

The natural convection flow phenomena that occur inside an enclosed space are very interesting examples of complex fluid systems that may yield to analytical, empirical and numerical solutions, and many reports have looked into this basic problem. In the present study, heat transfer and fluid flow for natural convection in a horizontal rectangular container with a free surface are investigated using infrared thermography. The temperature field was measured and visualized at a gas-liquid (air -silicon oil) interface using infrared thermography. The heat transfer phenomena were also investigated by statistically analyzing the temperature data. The applicability of the infrared thermography to quantitative heat transfer measurement at the gas-liquid interface was evaluated. It is revealed that infrared thermography is effective not only in visualization of a gas-liquid interface but also in heat transfer measurement. A new heat transfer correlation is proposed for the gas-liquid interface of this flow system. The coefficient of heat transfer can be summarized by a specific heat transfer correlation formula regardless of several conditions, including container aspect ratio, fluid viscosity and fluid layer depth.

A Quasi-Implicit Time-Advancing Scheme for 3-D Rayleigh-Bénard Convection

“…This problem has attracted many studies, but many questions remain to be answered. Some researchers employ experimental methods [1][2][3][4][5], others use numerical approaches [6][7][8]. Prediction of the critical Rayleigh number (Ra cr ) for initiating Bénard cells and explanation of sudden shape changes of the symmetric Bénard cells are essential topics of studying RB convection.…”

“…Numerous numerical methods have been applied to analyze this problem in recent years. Many of the global features observed in numerical solutions are supported by experimental observations [1][2][3][4][5]. Recently, various researchers have employed numerical methods to investigate the bifurcations to oscillatory flows in RB convection [6][7][8].…”

Visualization of turbulence structure in unsteady non-penetrative thermal convection using liquid crystal thermometry and stereo velocimetry

“…In recent years, the thermal turbulence has been studied using visualization techniques (Dabiri and Gharib, 1996;Funatani and Fujisawa, 2002;Banerjee et al, 2006;Inagaki et al, 2006). The three-dimensional temperature and velocity field in Rayleigh-Bernard convection is measured using scanning liquid-crystal thermometry and a stereo velocimetry (Fujisawa et al, 2005).…”