An experimental analysis in horizontal convection with IR thermography

Abstract

The aim of this work is to investigate by means of infrared thermography the features of the boundary layer developing on the bottom base of a water-filled volume where a differential heating input is provided. The circulation induced by piecewise thermal conditions on a horizontal boundary is commonly referred as horizontal convection. In the present study, a uniform temperature is imposed on one half of the bottom base of a Plexiglass® box filled with degassed water, while on the other half a uniform heat flux input is provided; on the other box boundaries, the condition of adiabatic wall is reproduced. The range of tested RaL numbers (referred to the heat flux input and box depth) is 5.54x10 9 ÷7.63x10 10 . The transition of the boundary layer and the development of the time evolution of the coherent structures motion are observed on the half base where the uniform heat flux input is provided. At the same location, the onset of longitudinal streamwise rolls and, subsequently, the rise of a strong vertical plume are followed for all the tested operating conditions.

Investigation of the effect of different materials on convective heat transfer

“…Jamalabadi [22] used infrared camera to investigate the most significant parameters that governed the surface temperature of thin plate under convection heat transfer. Whereas, Ceglia and Discetti [23] investigated the thermal boundary layer across the horizontal plate by using infrared thermography. All the above mentioned literatures provide some insights on correlation of flow patterns to convective heat transfer coefficient.…”