Paper 5: Direct Contact Heat and Mass Transfer Studies with Water Droplets in a Water Vapour–Air Mixture

1969 ◽  
Vol 184 (7) ◽  
pp. 1-5
Author(s):  
A. Porteous
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Water Vapour ◽  
Direct Contact ◽  
Droplet Diameter ◽  
Experimental Information ◽  
Water Droplets ◽  
Contact Heat ◽  
Process Industries ◽  
Mass Transfer Studies

The design of cooling and dehumidification towers is important for many process industries. This paper reports the results of a theoretical and experimental investigation on the direct contact heat and mass transfer characteristics of water droplets in counter-current flow through a water vapour-air mixture which simulates the stream to be dehumidified. The range of temperatures and dew points studied was 250–410°F and 85–112°F respectively. The effect of parameters such as contact path length, water droplet to water vapour-air mass ratios, droplet diameter, and entrainment are studied. The experimental information is then utilized in the design of a dehumidification tower.

Fundamental Investigation of Direct Contact Heat Exchange for Application in HVAC Systems: A Case Study

2006 ◽  
Author(s):  
Joshua L. Hensley ◽  
James E. Bryan
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Transfer Process ◽  
Direct Contact ◽  
Mass Transfer Process ◽  
Humid Climate ◽  
Contact Heat ◽  
Numeric Model ◽  
Temperature And Humidity

An air conditioning system based on a direct contact heat and mass transfer process between water and air may offer benefits such as increased energy efficiency, temperature and humidity control, and improved indoor air quality. To investigate the feasibility of this type of technology, a numeric model is used to study the heat and mass transfer between a single droplet and moist air to gain fundamental insight into the heat and mass transfer process. Further, preliminary experiments are performed in a low speed temperature and humidity controlled wind tunnel to validate some of the models findings, e.g. the effect of droplet size on heat and mass transfer. A case study is presented to investigate how such a system would operate in a hot, dry climate as well as a hot and humid climate.

Modeling 3D conjugate heat and mass transfer for turbulent air drying of Chilean papaya in a direct contact dryer

2016 ◽  
Vol 53 (1) ◽  
pp. 11-24 ◽  
Author(s):  
Roberto A. Lemus-Mondaca ◽  
Antonio Vega-Gálvez ◽  
Carlos E. Zambra ◽  
Nelson O. Moraga
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Direct Contact ◽  
Air Drying

scholarly journals Investigation of Regularities of Heat and Mass Transfer and Phase Transitions during Water Droplets Motion through High-Temperature Gases

2014 ◽  
Vol 6 ◽  
pp. 865856 ◽  
Author(s):  
Roman S. Volkov ◽  
Olga V. Vysokomornaya ◽  
Genii V. Kuznetsov ◽  
Pavel A. Strizhak
Keyword(s):  
Mass Transfer ◽  
Phase Transitions ◽  
High Temperature ◽  
Heat And Mass Transfer ◽  
Water Droplet ◽  
Small Neighborhood ◽  
Droplet Evaporation ◽  
Optical Methods ◽  
Water Droplets ◽  
Two Phase

The macroscopic regularities of heat and mass transfer and phase transitions during water droplets motion through high-temperature (more than 1000 K) gases have been investigated numerically and experimentally. Water droplet evaporation rates have been established. Gas and water vapors concentrations and also temperature values of gas-vapor mixture in small neighborhood and water droplet trace have been singled out. Possible mechanisms of droplet coagulation in high-temperature gas area have been determined. Experiments have been carried out with the optical methods of two-phase gas-vapor-droplet mixtures diagnostics (“Particle Image Velocimetry” and “Interferometric Particle Imaging”) usage to assess the adequateness of developed heat and mass transfer models and the results of numerical investigations. The good agreement of numerical and experimental investigation results due to integral characteristics of water droplet evaporation has been received.

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