International Journal of Multidisciplinary Research and Development

International Journal of Multidisciplinary Research and Development


International Journal of Multidisciplinary Research and Development
International Journal of Multidisciplinary Research and Development
Vol. 4, Issue 7 (2017)

Effect of Jet Reynolds number on temperature time cooling curve on a run-out table


To Onah, Io Ofondu

Experimental studies by controlled accelerated impingement water jet cooling on the run-out table were carried out in MMLE ESUT, Nigeria through impingement water jets on the top of the hot steel plates which leads to heat transfer extractions. It aimed at to develop a predictive tool in order to control the temperature principle on the run-out table towards improving the mechanical and metallurgical properties of the steel product relatively achieved by alloying. The methodology undertaken for this research involved design and construction of experiments using a pilot scale run-out table with stationary plates. Both initial hot plate and water temperatures, control cooling time, controlled temperature ranges of 1600C to 2000C, and 2600C to 3000C, pressure, volumetric flow rates, impingement water jet 0.8mm of 30 number holes, nozzles to surface spacing of 40mm 50mm, 60mm and 70mm, and pipe diameters of 20mm, 25mm, 32mm and 45mm were parameters investigated. Experimentally, three k-type thermocouples were instrumented and installed 9mm from the bottom surface of the plate of 230mm length and 120mm by width. Temperature measurements were taken at impingement target on where convectional and evaporation cooling occurred. Conduction heat transfer modelling allowed the calculation of zero temperature. Transient state temperature across the workpiece was done by Visual Basic Heat Transfer (VBHT) model and MATLAB was employed to analyzed jet flow rates of Reynolds number. From transient cooling data obtained, effects of jet Reynolds number were analyzed. The flow rates were found to be at peak cooling of Re= 2758.596 in the turbulent regime, followed by others at transition states and the least at Re= 860.901 laminar regime. This depicts that the higher the Reynolds number, the higher the flow rate.
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How to cite this article:
To Onah, Io Ofondu. Effect of Jet Reynolds number on temperature time cooling curve on a run-out table. International Journal of Multidisciplinary Research and Development, Volume 4, Issue 7, 2017, Pages 87-96
International Journal of Multidisciplinary Research and Development