scholarly journals Manufacturing of a 3D finned tube for enhanced boiling and condensation using rolling-cutting-extruding composite forming

2021 ◽  
Author(s):  
Xiaofang Huang ◽  
Hanping Chen ◽  
Zhenping Wan ◽  
Longsheng Lu ◽  
Hongguan Zhu ◽  
...  
Keyword(s):  
Finned Tube ◽  
Composite Forming ◽  
Enhanced Boiling

scholarly journals Manufacturing of a 3d Finned Tube for Enhanced Boiling and Condensation Using Rolling-cutting-extruding Composite Forming

2021 ◽  
Author(s):  
Xiaofang Huang ◽  
Hanping Chen ◽  
Zhen-ping Wan ◽  
Longsheng Lu ◽  
Hongguan Zhu ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Cutting Tools ◽  
Helix Angle ◽  
Finned Tube ◽  
Transfer Enhancement ◽  
Limit Value ◽  
Composite Forming ◽  
High Efficient ◽  
Enhanced Boiling ◽  
Condensation Structure

Abstract 3D finned tube is a high efficient enhanced heat transfer element and its manufacturing has always been the focus of research’s attention. It is a challenging job to manufacture a 3D finned tube that can enhance both boiling and condensation because the enhanced boiling structure is completely different from the enhanced condensation structure due to different heat transfer enhancement mechanisms. An innovative rolling-cutting-extruding composite forming method is developed to realize the manufacture of a staggered stepped lattice finned tube (SLFT) with helical fins, two layers of staggered stepped lattice fins and inner helical threads, which can enhance boiling as well as condensation heat transfer. The three skewed rolling-cutting tools specially designed are uniformly distributed around the base tube and the kinematics conditions of rolling-cutting-extruding process is analyzed. The relative plunge depth of a rolling blade can’t exceed a certain limit value and the feeding angle has to be equal to the helix angle of outer helical fin. According to the kinematic conditions, the parameters of the rolling-cutting tool are selected and processing experiments of the SLFT are conducted.

EHD Enhancement of Nucleate Boiling

1990 ◽  
Vol 112 (2) ◽  
pp. 458-464 ◽  
Author(s):  
P. Cooper
Keyword(s):  
Heat Transfer ◽  
Electric Field ◽  
Nucleate Boiling ◽  
Finned Tube ◽  
Transfer Coefficients ◽  
Concentric Cylinder ◽  
Oil Mixtures ◽  
Boiling Hysteresis ◽  
Enhanced Boiling ◽  
Electrically Enhanced

This paper describes: (a) an experimental investigation into the effect of an electric field applied to pool boiling of Freon (R114) on a finned tube and (b) a theoretical model of electrically enhanced nucleate boiling applicable to simple surfaces only. Experimental results have shown electrohydrodynamic (EHD) enhancement of heat transfer to be manifest in two ways: (i) elimination of boiling hysteresis, (ii) augmentation of nucleate boiling heat transfer coefficients by up to an order of magnitude. These effects were also observed in electrically enhanced boiling of Freon/oil mixtures. A new analytical model is described whereby EHD nucleate boiling data from previous studies (employing simple apparatus comprising heated wires with concentric cylinder electrodes) have been correlated for the first time using the concept of an electrical influence number. This dimensionless parameter is based upon the relationship between applied electric field intensity and changes in bubble departure diameter at a heat transfer surface.

HEAT AND MASS TRANSFER AND RESISTANCE CHARACTERISTICS OF EVAPORATIVE AIR COOLER WITH HIGH FINNED-TUBE BUNDLES

2018 ◽  
Vol 49 (17) ◽  
pp. 1705-1720 ◽  
Author(s):  
Qing Zhang ◽  
Xuesheng Wang ◽  
Weicheng Ruan ◽  
Qinzhu Chen ◽  
Zilong Liu
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Finned Tube ◽  
Tube Bundles ◽  
Air Cooler

FLOW AND DEPOSITION STUDIES ACROSS A MODEL FINNED TUBE

1994 ◽  
Author(s):  
V. Yeo ◽  
T. Reg Bott ◽  
C.R. Bemrose
Keyword(s):  
Finned Tube

Oval Finned Tube Condenser and Design Pressure Limits

2001 ◽  
Vol 8 (3) ◽  
pp. 147-158 ◽  
Author(s):  
Ralph L. Webb ◽  
Ajay Iyengar
Keyword(s):  
Finned Tube ◽  
Tube Condenser ◽  
Design Pressure

Pure Vapour Condensation of Refrigerants 11 and 113 on a Horizontal Integral Finned Tube at High Vapour Velocity

1993 ◽  
Vol 1 (1) ◽  
pp. 77-86 ◽  
Author(s):  
B. Bella ◽  
Alberto Cavallini ◽  
Giovanni A. Longo ◽  
Luisa Rossetto
Keyword(s):  
Finned Tube ◽  
Vapour Condensation
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