Title: Liquid quenchant database: determination of heat transfer coefficient during quenching
Authors: Imre Felde
Addresses: Óbuda University 1034 Budapest Bécsi út 96/B, Budapest, Hungary
Abstract: The estimation of thermal boundary conditions occurring during the immersion quenching processes is an essential requirement for characterisation of the heat transfer phenomena. In this work, six numerical techniques that are used to calculate the heat transfer coefficient (HTC), HTC(t) functions during immersion quenching of the ISO 9950 probe are compared. The estimation of the HTC(t) functions has been performed by seven contributors (from three continents) using the six different numerical techniques. First, hypothetical HTC(t) function generated and then these function applied to calculate cooling curves by using 1D axis symmetrical heat transfer model. The contributors performed inverse heat conduction problem (IHCP) calculations to recover the original HTC(t) functions using the cooling curves. The accuracy and the relevancy of the estimation approaches applied are evaluated by using error functions. In this paper, the activities obtained at the Step 2 of the project 'Liquid Quenchant Database' initiated by the International Federation for Heat Treatment and Surface Engineering are summarised.
Keywords: quenching; HTC; heat transfer coefficient; IHCP; inverse heat conduction problem; liquid quenchant database; thermal boundary conditions; cooling curves.
International Journal of Microstructure and Materials Properties, 2016 Vol.11 No.3/4, pp.277 - 287
Received: 25 Aug 2015
Accepted: 05 May 2016
Published online: 14 Sep 2016 *