Transient spray cooling of top and bottom moving high temperature surfaces
type: CreativeWork
description: High pressure water spray cooling, widely used in various industrial processapplications due to high impact force and high dissipating ability which is required invarious manufacturing processes such as scale removal from oil wells, scale removalfrom crude oil storage tanks, steel making, including continuous casting and descaling.The conditions and methods used in these processes are vital. There arenumber of available reports which are concerned with water spray cooling process todetermine the most effective conditions and methods of cooling. However, there is alack of comprehensive information regarding the fluid dynamics of spraycharacteristics upon their impaction on the hot moving surfaces.The objective of this experimental study is to use high-pressure water spraysimpacting on the top and bottom surfaces of a moving hot plate, by using speciallydeveloped experimental techniques.For control of spray characteristics, three full cone atomisers were used with exitorifice diameters are 0.94, 1.19 and 1.70 (mm}, at water spray pressures of 0.69, 1.38and 2.07 (MPa), impacting at 140 and 240 (mm) on a heated surface. For presentwork, a new transient cooling is developed to investigate upward and downwardsprays characteristics impacting on hot moving surface. The apparatus uses a rotatingsteel disk, which is preheated by gas burners. The water spray then impacts on the hotdisk through a rectangular orifice for providing a central and relatively homogeneousregion. A slip ring commutator is used to measure the time dependent temperature bythe direct contact method using K-type thermocouples.Heat transfer tests with heated surface temperatures 200, 300 and 400 °C, aredescribed under transient conditions sprays on both sides of the heated surface, whichrotates at 60 and 120 (rpm). It is found that the heat transfer coefficient increasedlinearly with increasing surface temperature and increasing flow rate. The three fullcone atomisers are used to study the effects of mass …
abstract: High pressure water spray cooling, widely used in various industrial processapplications due to high impact force and high dissipating ability which is required invarious manufacturing processes such as scale removal from oil wells, scale removalfrom crude oil storage tanks, steel making, including continuous casting and descaling.The conditions and methods used in these processes are vital. There arenumber of available reports which are concerned with water spray cooling process todetermine the most effective conditions and methods of cooling. However, there is alack of comprehensive information regarding the fluid dynamics of spraycharacteristics upon their impaction on the hot moving surfaces.The objective of this experimental study is to use high-pressure water spraysimpacting on the top and bottom surfaces of a moving hot plate, by using speciallydeveloped experimental techniques.For control of spray characteristics, three full cone atomisers were used with exitorifice diameters are 0.94, 1.19 and 1.70 (mm}, at water spray pressures of 0.69, 1.38and 2.07 (MPa), impacting at 140 and 240 (mm) on a heated surface. For presentwork, a new transient cooling is developed to investigate upward and downwardsprays characteristics impacting on hot moving surface. The apparatus uses a rotatingsteel disk, which is preheated by gas burners. The water spray then impacts on the hotdisk through a rectangular orifice for providing a central and relatively homogeneousregion. A slip ring commutator is used to measure the time dependent temperature bythe direct contact method using K-type thermocouples.Heat transfer tests with heated surface temperatures 200, 300 and 400 °C, aredescribed under transient conditions sprays on both sides of the heated surface, whichrotates at 60 and 120 (rpm). It is found that the heat transfer coefficient increasedlinearly with increasing surface temperature and increasing flow rate. The three fullcone atomisers are used to study the effects of mass …
author: Abdalla, AM
language: en
date published: 2004
date modified: 2026-07-24T04:26:14Z
provider: U. of Salford
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: U. of Salford