V型条缝喷嘴切割比对速冻机钢带表面换热特性的影响  

Influence of V type slit nozzle cutting ratio on belt surface heat transfer characteristics of quick freezer

作　　者：王金锋[1,2,3,4,5] 李文俊 谢晶[1,2,3,4,5] 杨大章 柳雨嫣[1,2] 陆卫华 杨晓燕 WANG Jin-feng;LI Wen-jun;XIE Jing;YANG Da-zhang;LIU Yu-yan;LU Wei-hua;YANG Xiao-yan(College of Food Sciences ＆ Technology , Shanghai Ocean University, Shanghai 201306, China;Quality Supervision, Inspection and Testing Center for Cold Storage and Refrigeration Equipment, Ministry of Agriculture, Shanghai 201306, China;Shanghai Professional Technology Service Platform on Cold Chain Equipment Performance and Energy Saving Evaluation, Shanghai 201306, China;National Experimental Teaching Demonstration Center for Food Science and Engineering , Shanghai 201306, China;Shanghai Engineering Research Center of Aquatic Product Processing ＆ Preservation Shanghai 201306, China;Nantong Square Cold Chain Equipment Company, Nantong , Jiangsu 226371, China)

机构地区：[1]上海海洋大学食品学院,上海201306 [2]农业部冷库及制冷设备质量监督检验测试中心,上海201306 [3]上海冷链装备性能与节能评价专业技术服务平台,上海201306 [4]食品科学与工程国家级实验教学示范中心[上海海洋大学],上海201306 [5]上海水产品加工及贮藏工程技术研究中心,上海201306 [6]南通四方冷链装备股份有限公司,江苏南通226371

出　　处：《食品与机械》2018年第4期94-98,共5页Food and Machinery

基　　金：国家“十三五”重点研发项目(编号：2016YFD0400303);上海海洋大学科技发展专项基金(编号：A2-0203-17-100207);上海海洋大学博士科研启动基金(编号：A2-0203-17-100317);上海市科委平台能力提升项目(编号：16DZ2280300);上海市科委公共服务平台建设项目(编号：17DZ2293400)

摘　　要：以冲击式速冻机的V型条缝喷嘴为研究对象,研究不同切割比(在V型条缝喷嘴喉部区域,喷嘴边缘被切割高度T与喷嘴纵向中心处高度K的比值,其中K=30 mm)下,改变钢带与喷嘴出口间距H与条缝宽度S之比Hs对速冻机冻结区域表面换热特性的影响。结果表明:当Hs<10,切割比Ψ=0时,沿速冻机宽度方向即X方向钢带表面换热强度存在明显差异,X/S(速冻机宽度方向坐标与喷嘴宽度S之比)=0处的钢带表面Nu数明显大于X/S=150处的;当Hs<10,随着切割比Ψ增加,沿X方向钢带表面换热强度差异性逐渐降低,到达临界切割比Ψ0之后继续增加Ψ,钢带表面换热强度出现逆增长;临界切割比Ψ0曲线随Hs的增加呈现先增大后减小的趋势;当Hs>10,沿X方向钢带表面不同位置处换热均匀性较强,调整切割比反而降低了钢带表面换热均匀性。V type slot nozzle in an impact type quick freezer was selected as the research object,and the surface heat transfer characteristics of the freezing area of the freezer were studied,based on different cutting ratio,the ration of distance between the belt and nozzle inlet H to slit width S,Hs.The results showed that the steel surface heat transfer intensity was obvious different along with width of freezer when the Hs〈10 andΨ=0.The steel surface Nu number in X/S=0 was significantly higher than that of X/S=150（The ratio between width direction of quick freezer coordinates and nozzle width S）.With the cutting ratio increasing along the X direction of the strip surface,heat transfer intensity difference gradually decreased,after the cutting critical ratioΨ0,the metal surface heat transfer intensity reversed growth,which indicated that the Nu number at X/S=0 was less than that at X/S=150.The cutting critical ratio with the increasing of Hs increased first and then decreased.When Hs〉10,the heat transfer coefficient was even in the direction of X,however,the adjusting of the cutting ratio would adversely affect the freezing heat transfer surface area.

关 键 词：速冻机 V型条缝喷嘴 切割比 换热强度 

分 类 号：TS203[轻工技术与工程—食品科学]