Estimation of Heat Flux During Spray Quenching Process Using Revision Measured Data

Abstract

Quenching can be defined as, cooling of metals at a rate faster than cooling in the still air which is widely used for controlling the mechanical and metallurgical properties in the metal manufacturing and material processing industries. An experimental and numerical study of transient boiling heat transfer during a cooling of a hot circular aluminum alloy plate AA6082 has been made. A developed technique using the processed readings as a basis in the approach to solving has been applied. This technique depends on the revision of experimental measured data, which used as input of the numerical solutions to calculate the heat flux. On one of its surfaces, a thin heated metal plate is exposed to a nozzle, while on the other, an infrared camera measures the temperature (T). The measured temperature data from the plate hot surface is the primary interest in the metal quenching process for the heat flux estimation. Based on the region of temperature, the heat transfer mechanism during quenching will also change, ie. film boiling, transition boiling and nucleate boiling. Measured temperature data are further processed through the numerical solutions one dimensional (1D) and two dimensional (2D) analyses. The surface heat flux was estimated for both 1D and 2D numerical methods for two different cases data (processed and unprocessed). This confirms clearly that while the behaviors are the same, using processed data is better than employing unprocessed data..