TRANSIENT HEAT CONDUCTION DURING QUENCHING OF DOWNWARD FACING COPPER AND STAINLESS STEEL CONVEX SURFACES

Abstract

Abstract Quenching experiments were performed to determine the effect of watt material properties on pool boiling heat transfer for downward facing convex surfaces( radius of curvature 218.5 mm) in saturated water. Experiments employed 303e-type stainless steel and copper test sections having identical dimensions ( 75 mm in diameter and 20 mm thick). Pool boiling curves were constructed on the basis of two-dimensional numerical solution of transient heat conduction in spherical coordinates( r, 9) in test sections during quenching. The measured temperature histories at nine interior locations near the boiling surface ( ∼0.5 mm) provided a time-dependent boundary condition for the numerical solution. To ensure stability and reduce both computer storage and execution time, the numerical solution used the alternating direction implicit ( ADD method with control volume representations. A sensitivity analysis was conducted to assess the effect of grid size on computation time as well as the accuracy of calculat...