Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Development of a test section for determination of local heat transfer coefficient during in-tube flow
Submission Author:
Brunno Abreu da Fonseca Vargas , RJ
Co-Authors:
Brunno Abreu da Fonseca Vargas, Matheus Constantino, Fabio Toshio Kanizawa
Presenter: Brunno Abreu da Fonseca Vargas
doi://10.26678/ABCM.COBEM2021.COB2021-1248
Abstract
This study presents the development of a test section for experimental determination of local heat transfer coefficient during single and two-phase flow inside tubes, focused on applications with secondary flow for heating or cooling. The non-intrusive experimental apparatus was developed using thermopiles to increase the sensitivity of the measurements. The heat transfer coefficient was estimated based on thermal resistance analysis and temperature measurement. The test section consists in a copper tube with 4.8 mm of internal diameter and 420 mm long, partially coated with polymeric material. Initially, the heat flux is imposed by an electrical resistor actuated by adjustable power supply. Experiments were performed for Reynolds between 982 and 4744 to determine the local heat flux and heat transfer coefficient. The results were compared with predictive methods widely adopted in the literature. Based on the experiments, the heat flux uncertainty was estimated as ± 6.2%. An uncertainty up to 9.1% has been obtained for heat transfer coefficient. Based on the developed prototype it is expected to perform experiments for condensation inside channels obtaining local heat transfer coefficients.
Keywords
convection heat transfer., Thermopile, Heat flux sensor
