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Thermal Characteristics of Air-Water Spray Impingement Cooling of Hot Metallic Surface under Controlled Parametric Conditions

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Journal of Thermal Science 2016年第3期25卷 266-272页

作者： Santosh Kumar Nayak Purna Chandra Mishra School of Mechanical Engineering KIIT University

Experimental results on the thermal characteristics of air-water spray impingement cooling of hot metallic surface are presented and discussed in this *** controlling input parameters investigated were the combined air and water pressures,plate thickness,water flow rate,nozzle height from the target surface and initial temperature of the hot *** effects of these input parameters on the important thermal characteristics such as heat transfer rate,heat transfer coefficient and wetting front movement were measured and *** flat plate samples of mild steel with dimension 120 mm in length,120 mm breadth and thickness of 4 mm,6 mm,and 8mm respectively were *** air assisted water spray was found to be an effective cooling media and method to achieve very high heat transfer rate from the *** heat transfer rate and heat transfer coefficients were obtained for the lesser i.e,4 mm thick *** in the nozzle height reduced the heat transfer efficiency of spray *** an inlet water pressure of 4 bar and air pressure of 3 bar,maximum cooling rates670℃/s and average cooling rate of 305.23℃/s were achieved for a temperature of 850℃ of the steel plate.

关键词： air-water spray transient temperature cooling rate plate thickness

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Stress concentration coefficients of optimized cope-hole welded detail

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Journal of Modern Transportation 2017年第4期25卷 279-286页

作者： Ping Liao Renda Zhao Xing Wei Yi Jia Lingzhi Cui Yongbao Wang School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China

The fatigue performance of optimized welded detail has been investigated by fatigue experiments of three welded specimens under different *** addition,local finite element models of this welded detail were established using finite element software *** influences of different factors such as plate thickness,plate gap and initial geometric imperfections on the stress concentration coefficient(SCC) were *** experimental results indicate that the fatigue life of three specimens for this welded detail is 736,000,1,044,200 and 1,920,300 times,*** web thickness,the filler plate thickness and the initial geometric imperfection have relatively less effect on the SCCs of this welded ***,cope-hole radius is influential on the SCCs of the web and the *** SCC of weld is significantly affected by the weld size and plate gap,but the SCCs of other parts of the welded detail are hardly affected by the plate gap.

关键词： Steel bridge Optimized welded detail Fatigue performance Fatigue experiment Stress concentration coefficient(SCC) Cope hole plate thickness Initial geometric imperfection

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Design and Engineering Application of Direct Mixing Lubrication System for Emulsion Pipeline in Secondary Cold Rolling Mill

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Mechanical Engineering Science 2020年第1期2卷 36-47页

作者： Hangzhe DONG Yazhen ZHANG Wantong HU Zhen-hua BAI Yan-yan ZHANG National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityYanshan UniversityQinhuangdaoChina State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdaoChina

With the benefit fierce competition in the steel industry market in recent years,double cold reduction products have been developed towards strength improvement and thickness *** traditional cold-rolling lubrication process with a fixed flow rate and concentration cannot solve the problems,which are uncontrollable plate shape and the excessive consumption of lubricating ***,based on the analysis of the traditional direct aplication lubrication system of double cold reduction mill,a set of design scheme suitable for the emulsion pipeline direct mixing lubrication system of double cold reduction mill unit was *** design completed the selection of key components,which included the static mixer and atomization nozzle selection,pump and oil pump design selection,pipeline design selection,flow type selection,pressure gauge selection,electronic control cabinet design selection and other eight *** of the emulsion pipeline direct mixing lubrication system of double cold reduction has been *** with characteristics of the traditional direct aplication lubrication system,the emulsion pipeline direct mixing lubrication system was better applied to the production practice of a 1220 double cold reduction *** consumption of ton of steel was reduced by 9.6%.The rolling energy consumption and fuel consumption comprehensive costs decreased by 10.7%,and the strip steel section thickness difference was reduced by 19.3%.In addition,the plate shape quality defect rate decreased by 25.6%,otherwise creating a large economic benefit for the unit and promoting the application value.

关键词： double cold reduction emulsion direct mixing lubrication system static mixer plate thickness

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