Experimental investigation on the heat transfer performance of falling film evaporation with lubrication oil on horizontal tubes having different structures

2021 ◽  
Vol 160 ◽  
pp. 106669
Author(s):  
Yingling Li ◽  
Minxia Li ◽  
Yuhan Li ◽  
Wensheng Cai ◽  
Liang Yao
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Heat Transfer Performance ◽  
Transfer Performance ◽  
Falling Film ◽  
Film Evaporation ◽  
Horizontal Tubes ◽  
Lubrication Oil ◽  
Falling Film Evaporation

Experimental Investigation of Falling Film Evaporation on Horizontal Tubes at Low-Pressure

2011 ◽  
Vol 236-238 ◽  
pp. 1572-1575 ◽  
Author(s):  
Hong Liu ◽  
Hu Gen Ma ◽  
Chang Sheng Li
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Flow Rate ◽  
Heat Transfer Performance ◽  
Transfer Performance ◽  
Falling Film ◽  
Film Evaporation ◽  
Horizontal Tubes ◽  
Falling Film Evaporation ◽  
The Impact

Experimental investigation of falling film evaporation on horizontal tubes was carried out in this paper. Tube surface, spray flow rate and coolant flow rate were the factors considered in the experiment. The impact on falling film evaporation performance was obtained as expected. Experimental results are obtained that the heat transfer performances of low finned tubes are better than that of smooth tubes. The increasing of flow rate enhances heat transfer performance of falling film evaporation at first, while the flow rate gets a certain value, it will hinder the improvement of heat transfer performance. It was also found that there is almost no effects on heat transfer coefficient when the flow rate of coolant changes.

scholarly journals CFD studies on the influence of un-wetted area on the heat transfer performance of the horizontal tube falling film evaporation

2021 ◽  
pp. 56-56
Author(s):  
Dilli Balaji ◽  
Ramalingam Velraj ◽  
Malavarappu Ramanamurthy
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Heat Transfer Performance ◽  
Horizontal Tube ◽  
Published Data ◽  
Transfer Performance ◽  
Falling Film ◽  
Film Evaporation ◽  
Falling Film Evaporation ◽  
Wetted Area

This paper discusses about the effect of un-wetted area of tube on the heat transfer performance of horizontal tube falling film evaporation. A 2D CFD model was developed to perform simulations and investigate the output and validated them with published data available in the literature. In the present study the VOF method is used to track the boundary of the liquid vapour from the contours of volume fraction. Effect of varying tube wall temperature or wall super heat (6 to 11?C) on un-wetted area, heat transfer co-efficients and mass transfer co-efficients of the circular tube were obtained from the simulation model and the results were analysed and reasons were identified and discussed here. The threshold value of wall super heat above which phase change occurs between liquid film and tube surface is identified as 6?C. Also it is noted that mass transfer rate increases and then decreases with increase of wall super heat and heat transfer co-efficient showed declining trend.

Augmentation of Thin Falling-Film Evaporation on Horizontal Tubes Using an Applied Electric Field

1999 ◽  
Vol 122 (2) ◽  
pp. 391-398 ◽  
Author(s):  
J. Darabi ◽  
M. M. Ohadi ◽  
S. V. Dessiatoun
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Electric Field ◽  
Transfer Coefficient ◽  
Applied Electric Field ◽  
Falling Film ◽  
Film Evaporation ◽  
Horizontal Tubes ◽  
Falling Film Evaporation ◽  
The Heat Transfer Coefficient

Heat transfer enhancement of falling-film evaporation on commercially available horizontal tubes using an applied electric field was studied experimentally. The tube surfaces tested included: smooth, 19 fins per inch (19 fpi) low-fin type, and Turbo BIII which is a state-of-the-art commercially available boiling tube. The nominal outside diameters of all the tubes were 19 mm. Experiments were performed with R-134a at a saturation pressure of 550 kPa. Effects of heat flux, film flow rate, applied electric field potential, and heat transfer surface on the heat transfer coefficient were investigated. In addition, the effect of Poloyl-ester oil on the heat transfer coefficients was also investigated. Experiments were conducted for oil concentrations ranging from 0.5 percent to 5 percent on a mass basis. Small concentrations of a poloyl-ester lubricant were found to improve the heat transfer performance, while large concentrations reduced the heat transfer coefficient. [S0022-1481(00)00702-7]

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