Analysis and evaluation of heat flux models for spray quenching

The aim was to develop, analyse and evaluate heat flux models for spray quenching. Experiments of the spray cooling procedure were to be done and were supposed to generate data that could be used to verify the correlations in the heat flux models. The primary aim was to accomplish the experiments. The secondary aim was to begin the development of the heat flux models and create a basis for future work. The heat flux models were supposed to be mathematical models implemented in a computer software and general for any type of spray nozzles. The heat flux models were also supposed to be able to communicate with an auxiliary thermal FE-program. A heat transfer model based on both scientifically proven physical laws and empirical correlations was established.

An experimental set up in order to do the experiments was put together. It consisted of a test rig, measurement equipment and auxiliary equipment. The mathematical models were supposed to calculate the heat flux at a specified node of a part exposed to spray cooling. Special heat transfer correlations for spray quenching were used to calculate the heat flux. The evaluations of the results indicated that there was a significant difference between the theoretical temperatures and the measured surface temperatures. The conclusions are that the heat transfer model overestimates the heat flux and that the heat transfer model needs to be modified.

Author: Gavelin, Anders

Source: LuleƄ University of Technology

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