Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
EXPERIMENTAL STUDY ON THE SINGLE-PHASE CONVECTIVE HEAT TRANSFER COEFFICIENT IN THE TUBE QUENCHING PROCESS
Submission Author:
TULIO DA MOTTA CORREA , MG , Brazil
Co-Authors:
TULIO DA MOTTA CORREA, Juan Jose Garcia Pabon, Leonardo Victor Silva Martins, Luiz Machado, Lis Nunes Soares
Presenter: TULIO DA MOTTA CORREA
doi://10.26678/ABCM.ENCIT2018.CIT18-0508
Abstract
Immersion quenching is a thermal process frequently used to obtain required mechanical properties of steel products. Mathematical models allow to simulate different part geometries and cooling methods. However, a limitation of these models comes from the high uncertainty that exists in the value of the heat transfer coefficient (HTC) at the interface of the part surface and the quenchant. Knowledge and control of the HTC in various process conditions is necessary. An experimental work is carried out to study the HTC behavior during single-phase heat transfer by forced convection in the tube quenching process. Four different operating parameters are evaluated: tube surface temperature (50 - 100 °C), tube rotation speed (25 and 50 rpm), side jets water flow rate (0, 5 and 10 m³/h), and watjer temperature (25 and 35 °C). The proposed methodology has proved to be efficient in finding the HTC during the tube quenching process, presenting behaviors consistent with those indicated in the literature. The combination of side water jets and tube rotation results in a high heat removal capacity, showing significant HTC values still in the single-phase convection region.
Keywords
Heat transfer coefficient, single-phase convection, quenching
