Heat transfer from a hot moving cylinder impinged by a planar subcooled water jet

Abstract

A hot moving (rotating) cylinder was heated up to 500-600°C and then was cooled by a planar water jet impinging on a line parallel to the symmetry axis. The time dependent wall temperature was measured using embedded thermocouples and the corresponding wall heat fluxes were estimated through an inverse conduction method. In a recent paper, we showed that cooling rates depend on the subcooled temperature of the jet, the velocity of the jet and the surface-to-jet velocity ratio. Since the initial temperature of the cylinder was higher than the Leidenfrost temperature, we observed all the boiling regimes from film boiling to nucleate boiling. The objectives of this paper are firstly to describe the current conditions which exist in the Run Out Table in hot rolling mills, secondly to review the main experimental studies dedicated to jet cooling which have led to modelling heat transfer in boiling conditions and finally to propose new correlations taking into account the velocity of the wall.

Boiling Heat Transfer during Impingement of Two or Three Pipe Laminar Jets onto Moving Steel Sheet

“…Some studies have analyzed single-jet impingement onto a moving hot solid. [5][6][7] In addition, Ishigai et al, 8) Sakhuja et al, 9) Monde et al, 10) and Haraguchi and Hariki 11) examined multiple pipe laminar jets impinging onto a stationary hot steel plate. Recently, Vakili and Gadala 12) investigated boiling heat transfer on a hot moving plate, caused by multiple impinging water jets in rows.…”

Heat Transfer Characteristics of a Pipe-laminar Jet Impinging on a Moving Hot Solid

“…In their study, the initial plate temperature was up to 240°C and the moving velocity of the sheet was 0.5 m/s. Further, Gradeck et al 2,3) studied quenching of a hot rotating cylinder with an initial temperature of 500-600°C by a subcooled water jet. Recently, Mozumder et al 4) conducted experiments for investigating the quenching phenomena of a water jet impacting on a rotating cylinder at an initial temperature of 460-560°C.…”

Boiling Heat Transfer Characteristics of Vertical Water Jet Impinging on Horizontally Moving Hot Plate

“…This study is concerned with the pipe laminar cooling of a moving hot solid, and hence reviews related work in the area. Some research groups have studied the quenching process of a hot rotating metal cylinder through the impingement of a subcooled planar water jet 17,18) and a circular water jet. 19,20) In the experiments, jet impingement on a moving solid occurred once per rotation of the cylinder in order to implement a multi-jet impact test.…”