THE ROLE OF WAKES IN THE MECHANISM OF HEAT TRANSFER IN A SPRAY COLUMN HEAT EXCHANGER

1970 ◽  
Author(s):  
Ephraim Kehat
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Spray Column

scholarly journals Analytical Modelling of a Spray Column Three-Phase Direct Contact Heat Exchanger

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Hameed B. Mahood ◽  
Adel O. Sharif ◽  
Seyed Ali Hosseini ◽  
Rex B. Thorpe
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Heat Exchanger ◽  
Transfer Coefficient ◽  
Direct Contact ◽  
Relative Velocity ◽  
Contact Heat ◽  
Spray Column ◽  
Three Phase ◽  
Direct Contact Heat Exchanger

An analytical model for the temperature distribution of a spray column, three-phase direct contact heat exchanger is developed. So far there were only numerical models available for this process; however to understand the dynamic behaviour of these systems, characteristic models are required. In this work, using cell model configuration and irrotational potential flow approximation characteristic models has been developed for the relative velocity and the drag coefficient of the evaporation swarm of drops in an immiscible liquid, using a convective heat transfer coefficient of those drops included the drop interaction effect, which derived by authors already. Moreover, one-dimensional energy equation was formulated involving the direct contact heat transfer coefficient, the holdup ratio, the drop radius, the relative velocity, and the physical phases properties. In addition, time-dependent drops sizes were taken into account as a function of vaporization ratio inside the drops, while a constant holdup ratio along the column was assumed. Furthermore, the model correlated well against experimental data.

scholarly journals Numerical analysis and simulation of the heat recovery from wastewater using heat exchanger

2018 ◽  
Vol 240 ◽  
pp. 02005
Author(s):  
Timea Gabor ◽  
Ancuta-Elena Tiuc ◽  
Ioana Monica Sur ◽  
Iulian Nicolae Badila
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Recovery ◽  
Residential Buildings ◽  
Background Information ◽  
Mass And Heat Transfer ◽  
Increasing Demand ◽  
Reduction Of Energy Consumption ◽  
Pipe Heat

The problem of global warming and the reduction of energy consumption have led to an evolutionary progress of research directed towards finding as many solutions as possible to these environmental issues. Firstly, this paper presents the background information on the role of wastewater as a source of heat for the future. Next, the paper includes the analysis elements that define a system for recovering thermal energy from wastewater. The main objective was to identify the parameters that determine the heat transfer. It has started from a conceptual model of the technological system that involves inputs and outputs characterized by technological, physical-chemical, measurable or imposed properties. In the second part this paper presents a numerical model elaborated for the analysis and simulation of the main physical processes, the mass and heat transfer, which underlie the operation of the heat pipe heat exchangers (HPHE). The numerical simulation of heat and mass transfer in the HPHE is computed by using Delphi 7 solver program. This program contained a series of sub-programs for the meshing of the field occupied by the HPHE, another subprogram for solving the meshing equations and the third for post processing. The design of HPHE is the key to provide a heat exchanger system to work proficient as expected. Finally, the result is used to optimize and improving heat recovery systems of the increasing demand for energy efficiency in residential buildings or industry.

The mechanism of heat transfer in a spray column heat exchanger

AIChE Journal ◽  
1968 ◽  
Vol 14 (3) ◽  
pp. 398-405 ◽  
Author(s):  
Ruth Letan ◽  
Ephraim Kehat
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Spray Column
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