EXPERIMENTAL INVESTIGATION ON MASS TRANSFER CHARACTERISTIC OF STABLE STEAM JET CONDENSATION IN A RECTANGULAR MIX CHAMBER

2018 ◽  
Author(s):  
Xiao Zong ◽  
Jiping Liu ◽  
Cheng-Shi Yang ◽  
Junjie Yan
Keyword(s):  
Mass Transfer ◽  
Experimental Investigation ◽  
Transfer Characteristic ◽  
Mass Transfer Characteristic

A Fully Wet and Fully Dry Tiny Circular Fin Method for Heat and Mass Transfer Characteristics for Plain Fin-and-Tube Heat Exchangers Under Dehumidifying Conditions

2006 ◽  
Vol 129 (9) ◽  
pp. 1256-1267 ◽  
Author(s):  
Worachest Pirompugd ◽  
Chi-Chuan Wang ◽  
Somchai Wongwises
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Heat Exchanger ◽  
Heat And Mass Transfer ◽  
Heat Exchangers ◽  
Heat Transfer Characteristic ◽  
Transfer Characteristic ◽  
Tube Heat Exchanger ◽  
Mass Transfer Characteristic ◽  
Transfer Characteristics

This study proposes a new method, namely the “fully wet and fully dry tiny circular fin method,” for analyzing the heat and mass transfer characteristics of plain fin-and-tube heat exchangers under dehumidifying conditions. The present method is developed from the tube-by-tube method proposed in the previous study by the same authors. The analysis of the fin-and-tube heat exchangers is carried out by dividing the heat exchanger into many tiny segments. A tiny segment will be assumed with fully wet or fully dry conditions. This method is capable of handling the plain fin-and-tube heat exchanger under fully wet and partially wet conditions. The heat and mass transfer characteristics are presented in dimensionless terms. The ratio of the heat transfer characteristic to mass transfer characteristic is also studied. Based on the reduced results, it is found that the heat transfer and mass transfer characteristics are insensitive to changes in fin spacing. The influence of the inlet relative humidity on the heat transfer characteristic is rather small. For one and two row configurations, a considerable increase of the mass transfer characteristic is encountered when partially wet conditions take place. The heat transfer characteristic is about the same in fully wet and partially wet conditions provided that the number of tube rows is equal to or greater than four. Correlations are proposed to describe the heat and mass characteristics for the present plain fin configuration.

Temperature-Humidity Coupled Analysis in Battery Pack Based on Airflow Characteristics of Waterproof-breathable Valve

2021 ◽  
pp. 1-13
Author(s):  
Weijian Li ◽  
Fengchong Lan ◽  
Jiqing Chen
Keyword(s):  
Mass Transfer ◽  
Thermal Characteristic ◽  
Transfer Characteristic ◽  
Coupling Model ◽  
Air Pressure ◽  
Battery Pack ◽  
Transfer Model ◽  
Pressure Balance ◽  
Characteristic Analysis ◽  
Mass Transfer Characteristic

Abstract Waterproof breathable valves (WBV) are applied to the battery packs in electric vehicles due to their advantages of high efficiency waterproof and air-pressure balance. With the continuity of mass transfer of WBV and uncertain thermal conditions, the dynamic thermal characteristic of the moisture inside the battery pack is difficult to obtain by experiments, especially the phase change of the moisture. To analyze the temperature-humidity characteristic in the battery pack considering mass transfers of WBV, this study presents a temperature-humidity coupling model of the battery pack based on the mass transfer characteristic of WBV. A mass transfer model of WBV is developed with the airflow mass transfer characteristic in air pressure difference. The proposed models verified the feasibility of dynamic thermal characteristic analysis with experiments. Finally, a practical case study on a battery pack is used to study dynamic characteristics of the temperature-humidity during idle and working. Using the coupling model and the WBV model, temperature-humidity distribution and the location and time attributes of moisture condensation in the battery pack are effectively obtained. The inner walls of the pack casing and the battery surface near WBV are condensation areas during different environmental conditions.

Hydrodynamic and mass transfer characteristic of a novel grid-structured plastic packing

2011 ◽  
Vol 47 (8) ◽  
pp. 1035-1041 ◽  
Author(s):  
Markus Lehner ◽  
Karin Hoffmann ◽  
Werner Geipel
Keyword(s):  
Mass Transfer ◽  
Transfer Characteristic ◽  
Mass Transfer Characteristic

Numerical study on heat and mass transfer characteristic of plate absorber

2005 ◽  
Vol 25 (14-15) ◽  
pp. 2219-2235 ◽  
Author(s):  
Jung-In Yoon ◽  
Thanh-Tong Phan ◽  
Choon-Geun Moon ◽  
Pradeep Bansal
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Numerical Study ◽  
Transfer Characteristic ◽  
Mass Transfer Characteristic ◽  
Plate Absorber
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