Original scientific paper

Calculation of heat transfer coefficients

F. Vode ; Institute of Metals and Technology, Ljubljana, Slovenia
F. Tehovnik ; Institute of Metals and Technology, Ljubljana, Slovenia
B. Arh ; Institute of Metals and Technology, Ljubljana, Slovenia
S. Malej ; Institute of Metals and Technology, Ljubljana, Slovenia
B. Podgornik ; Institute of Metals and Technology, Ljubljana, Slovenia

Abstract

In forced-convection furnaces for reheating Al-alloys, convective heat transfer mechanism dominates. Al-body temperature prediction model uses measured furnace temperature as boundary condition. To calibrate such model, a convective heat transfer coefficient h is to be determined. Optimization technique is used here to determine h for every measured temperature sample so that measured temperatures match calculated, supposing radiative heat transfer coefficient constant and neglecting conductive heat transfer. Obtained h stably converges during normal reheating conditions. The obtained model is 4-fold cross-validated and obtained Root Mean Square Error of whole reheating profiles are [7,7; 20,4; 10,4; 12,5] °C.

Keywords

Al-body; convective heat transfer; forced-convection furnace; mathematical model; measured temperatures

Hrčak ID:

206473

URI

https://hrcak.srce.hr/206473

Publication date:

1.1.2019.

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