Heat and mass transfer in the process of fuel combustion in an air stream

1962 ◽  
Vol 5 (1-2) ◽  
pp. 11-21 ◽  
Author(s):  
B.V. Kantorovich ◽  
G.N. Delyagin
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Fuel Combustion ◽  
Air Stream

scholarly journals ANALYSIS OF HEAT AND MASS TRANSFER ON COOLING TOWER FILL

2020 ◽  
Vol 14 (1) ◽  
pp. 25
Author(s):  
Abdul Aziz Rohman Hakim ◽  
Engkos Achmad Kosasih
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Relative Humidity ◽  
Heat And Mass Transfer ◽  
Cooling Tower ◽  
Stream Velocity ◽  
Design Data ◽  
Analogy Method ◽  
Ambient Relative Humidity ◽  
Air Stream

This paper discusses heat and mass transfer in cooling tower fill. In this research, dry bulb temperature at the bottom fill, ambient relative humidity, air stream velocity entering fill, dry bulb temperature leaving the fill, relative humidity of air leaving the fill, inlet and outlet water temperature of cooling tower were measured. Those data used in heat and mass transfer calculation in cooling tower fill. Then, do the heat and mass transfer calculation based on proposed approch. The results are compared with design data. The design and analogy method showed different  result. The parameter which influence the heat transfer at cooling tower are represented by coefficient of heat transfer hl and coefficient of mass transfer k­l. The differencies result between design and analogy method shows that there is important parameter which different. Deeply study needed for it.

Heat and Mass Transfer With Liquid Evaporation Into a Turbulent Air Stream

1986 ◽  
Vol 108 (1) ◽  
pp. 4-8 ◽  
Author(s):  
T. Kumada ◽  
T. Hirota ◽  
N. Tamura ◽  
R. Ishiguro
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Turbulent Heat ◽  
Transfer Coefficients ◽  
Enhancement Of Heat Transfer ◽  
Heat Transfer Coefficients ◽  
Air Stream ◽  
Liquid Evaporation ◽  
Experimental Errors

Some of the previously reported heat transfer coefficients with evaporation are fairly large as compared with those of a dry body under similar hydrodynamic conditions. In order to clarify this curious enhancement of heat transfer, a method of error evaluation was developed and applied to correct the experimental errors in the recently reported results. An experimental study was also made on turbulent heat and mass transfer of air flowing over a water surface. The present and the previously reported experimental results revealed that the heat transfer coefficient with evaporation agrees with that of a dry body without evaporation, within experimental error, if the erroneous heat inputs into the liquid are properly corrected according to the proposed method.

Experimental Investigations on the Performance of a Cross Flow Air Heated Humidifier

2015 ◽  
Author(s):  
K. A. Khalid ◽  
A. S. Yassen ◽  
S. A. Salaudeen ◽  
M. A. Antar
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Surface Area ◽  
Cross Flow ◽  
Packing Material ◽  
Hot Water ◽  
Experimental Investigations ◽  
Heated Humidifier ◽  
Air Stream ◽  
Unit Effectiveness

A horizontal cross flow air heated humidifier is designed for three modes of heating. It is tested to investigate its performance in terms of its ability to effectively humidify air. The system investigated in this study has both the humidifier and the heater(s) integrated in one unit. Special low pressure-drop nozzles are used to spray water such that they provide a fine mist, thus they break a liquid to tiny droplets to increase the surface area for better heat and mass transfer between the hot air and sprayed water. Several attempts to improve system performance are made. For example, the effect of adding packing material to further increase heat and mass transfer surface area is attempted. Another attempt is by having an inter-stage heating such that a heating coil (basically a heat exchanger where hot water is circulated in a closed loop) is placed after a first-stage sprayer to heat the air again such that its ability to absorb more moisture increases as it is passed through a second-stage sprayer. A mist eliminator is placed at the exit of the humidifier to make sure water droplets are not allowed to leave the humidifier with the exit humid air stream. Performance parameters used in the analysis include the temperature and humidity of the exit air stream in addition to the humidifier effectiveness that is considered one of the crucial parameters in designing a HDH desalination system. A comparison between different modification to the humidifier are made to select the mode that results in the closest exit air stream to saturation condition and the highest humidifier effectiveness. Adding the packing material showed insignificant improvement to the humidifier performance. On the other hand, the inter-stage heating is believed to be effective in increasing the unit effectiveness.

Combined Heat and Mass Transfer in Porous Media Heat Exchanger

2002 ◽  
Author(s):  
Adriana M. Druma ◽  
Khairul M. Alam
Keyword(s):  
Mass Transfer ◽  
Porous Media ◽  
Heat Exchanger ◽  
Heat And Mass Transfer ◽  
Energy Recovery ◽  
Low Cost ◽  
Porous Matrix ◽  
Air Stream ◽  
The Matrix ◽  
Heat And Moisture

A numerical and experimental study of heat and mass transfer has been carried out for an energy recovery ventilator with a porous media heat exchanger. The energy recovery ventilator selected for this study has a rotary periodic heat exchanger that can transfer heat and moisture from one air stream to another. Such heat exchangers can be operated with high effectiveness by using a low-cost porous matrix as the heat exchanger medium. The influence of porosity in the matrix has been studied numerically and the performance of the energy recovery ventilator in recovering both heat and moisture has been modeled.

Heat and mass transfer along a wetted porous plate in an air stream

AIChE Journal ◽  
1996 ◽  
Vol 42 (7) ◽  
pp. 1833-1843 ◽  
Author(s):  
A. Belhamri ◽  
J.-P. Fohr
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Porous Plate ◽  
Air Stream
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