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

Authors

WANG Jinfeng, 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 Ocean University﹞, Shanghai 201306, China; Shanghai Engineering Research Center of Aquatic Product Processing & Preservation Shanghai 201306, China
LI Wenjun, 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
XIE Jing, 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 Ocean University﹞, Shanghai 201306, China; Shanghai Engineering Research Center of Aquatic Product Processing & Preservation Shanghai 201306, China
YANG Dazhang, 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 Ocean University﹞, Shanghai 201306, China; Shanghai Engineering Research Center of Aquatic Product Processing & Preservation Shanghai 201306, China
LIU Yuyan, 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
LU Weihua, Nantong Square Cold Chain Equipment Company, Nantong, Jiangsu 226371, China
YANG Xiaoyan, Nantong Square Cold Chain Equipment Company, Nantong, Jiangsu 226371, China

Abstract

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 and Ψ=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 ratio Ψ₀, 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.

Publication Date

4-28-2018

First Page

94

Last Page

98

DOI

10.13652/j.issn.1003-5788.2018.04.018

Recommended Citation

Jinfeng, WANG; Wenjun, LI; Jing, XIE; Dazhang, YANG; Yuyan, LIU; Weihua, LU; and Xiaoyan, YANG (2018) "Influence of V type slit nozzle cutting ratio on belt surface heat transfer characteristics of quick freezer," Food and Machinery: Vol. 34: Iss. 4, Article 18.
DOI: 10.13652/j.issn.1003-5788.2018.04.018
Available at: https://www.ifoodmm.cn/journal/vol34/iss4/18

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