Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

NUMERICAL ANALYSIS OF HEAT TRANSFER FOR JET IMPINGEMENT ON A HOT STEEL PLATE DURING SECONDARY COOLING

Get access (open in a dialog) DOI: 10.1615/IHTC16.mpf.022471
pages 6423-6430

Abstrakt

In the continuous casting process, water spray injected through rows of nozzles is used to remove heat from the slab to allow the slab to solidify. Quick heat removal from the slab without causing slab cracking and deformation is desired. The present study focuses on the development of a reliable numerical model which can precisely predict a heat transfer coefficient distribution for individual nozzle or in the overlap region when multiple nozzles are adopted. The flat fan atomizer was chosen as representative to be simulated. The spray pattern on the slab surface, as well as the impingement behaviors of water droplets are obtained through Eulerian-Lagrangian approach. The wall jet model coupled with modified evaporation rate depending on the droplet Weber number has been applied in order to take the vapor layer generated above the slab surface at high temperature into consideration. Simulation results reveal that the distribution of heat transfer coefficient is consistent with that of water droplets on the slab surface, and intense cooling can be observed in the center of spray where the concentration of droplets is the highest. The vapor layer generated above the slab surface at high surface temperature hinders heat transfer to some extents. In practice, the standoff distance should be adjusted with the distance between two adjacent nozzles accordingly, so that the spray coverage and the heat transfer coefficient can be as high as possible.