Transient Heat Transfer Study of Direct Contact Condensation of Steam in Spray Cooling Water

2017 ◽  
Vol 24 (2) ◽  
pp. 131-143 ◽  
Author(s):  
Yiping Wang ◽  
Yunfa Hu ◽  
Qunwu Huang ◽  
Yong Cui
Keyword(s):  
Heat Transfer ◽  
Direct Contact ◽  
Cooling Water ◽  
Spray Cooling ◽  
Transient Heat Transfer ◽  
Contact Condensation ◽  
Transfer Study

Effect of Water Temperature on Spray Cooling Heat Transfer on Hot Steel Plate

2010 ◽  
Author(s):  
Jungho Lee ◽  
Cheong-Hwan Yu ◽  
Sang-Jin Park
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Water Temperature ◽  
Steel Plate ◽  
Cooling Water ◽  
Local Heat ◽  
Spray Cooling ◽  
Transfer Coefficients ◽  
Cooling Water Temperature ◽  
Local Heat Flux

Water spray cooling is an important technology which has been used in a variety of engineering applications for cooling of materials from high-temperature nominally up to 900°C, especially in steelmaking processes and heat treatment in hot metals. The effects of cooling water temperature on spray cooling are significant for hot steel plate cooling applications. The local heat flux measurements are introduced by a novel experimental technique in which test block assemblies with cartridge heaters and thermocouples are used to measure the heat flux distribution on the surface of hot steel plate as a function of heat flux gauge. The spray is produced from a fullcone nozzle and experiments are performed at fixed water impact density of G and fixed nozzle-to-target spacing. The results show that effects of water temperature on forced boiling heat transfer characteristics are presented for five different water temperatures between 5 to 45°C. The local heat flux curves and heat transfer coefficients are also provided to a benchmark data for the actual spray cooling of hot steel plate cooling applications.

Heat transfer rate of direct-contact condensation on baffle trays

2008 ◽  
Vol 51 (25-26) ◽  
pp. 5772-5776 ◽  
Author(s):  
Srbislav B. Genić ◽  
Branislav M. Jaćimović ◽  
Ljubiša A. Vladić
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Rate ◽  
Direct Contact ◽  
Transfer Rate ◽  
Contact Condensation

B101 Characteristics of rewetting and transient heat transfer during spray cooling of hot surface

2012 ◽  
Vol 2012.17 (0) ◽  
pp. 35-38
Author(s):  
Yuichi Mitsutake ◽  
Masanori Monde ◽  
Shinichiro Hidaka ◽  
Hideto Takagi
Keyword(s):  
Heat Transfer ◽  
Spray Cooling ◽  
Transient Heat Transfer ◽  
Hot Surface

scholarly journals Analysis of Heat and Flow Characteristics on Spray Cooling Heat Transfer with an Optimized Hexagonal Finned Heat Sink

2017 ◽  
Author(s):  
Faruk Yesildal ◽  
Kenan Yakut
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Heat Sink ◽  
Cooling Water ◽  
Flow Characteristics ◽  
Optimization Method ◽  
Spray Cooling ◽  
Spray Angle ◽  
Operating Pressure ◽  
Taguchi Optimization

An experimental study was carried out with a hexagonal finned heat sink to obtain valuable information about the thermal and flow characteristics on spray cooling. Water was used as the refrigerant fluid and was atomized by an air-assisted atomizer and some of the variables that affect spray cooling process, such as breakup length and Sauter Mean Diameter (SMD) were obtained using appropriate correlations. The parameters most influential on the Nusselt number were determined and analyzed. Experiments were conducted for optimized conditions. The jet diameter and spray angle were determined via image processing using macroscopic aspects. Nusselt were demonstrated of hexagonal finned heat sink which optimized according to the Taguchi optimization method. The results of the spray analysis showed that SMD decreases with an increase in either air-liquid mass ratio (ALR) or operating pressure resulting in a more uniform spray. As the liquid flow rate increases in all ALR values, the heat transfer rate also increases markedly. As a results of the experiments, Nusselt number, jet width and spray angle correlations were developed. The relationship of ALR-Nu was demonstrated according to fin height and spraying time.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4772

An Experimental Investigation of OC-OTEC Direct-Contact Condensation and Evaporation Processes

1984 ◽  
Vol 106 (1) ◽  
pp. 120-127 ◽  
Author(s):  
R. G. Sam ◽  
B. R. Patel
Keyword(s):  
Heat Transfer ◽  
Direct Contact ◽  
Turbulent Jets ◽  
Operating Conditions ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Air Content ◽  
Thermal Energy Conversion ◽  
Ocean Thermal Energy ◽  
Contact Condensation

Heat transfer data are presented for direct-contact evaporator and condenser geometries suitable for Open-Cycle Ocean Thermal Energy Conversion (OC-OTEC) applications. Falling turbulent jets and films were tested at typical operating conditions. The flash evaporator performance was relatively constant over the range of conditions tested, with efficiencies as high as 95 percent due to the breakup of the jets (or films) into sprays. The condenser performance was only affected by the jet or film Reynolds number and the steam air content. Condenser heat transfer coefficients of the order of 27 kW/m2 °C were achieved with jets which were higher than those obtained with films. An empirical correlation was developed for the condenser data after it was shown that none of the existing correlations found in the literature could correlate all of the data trends observed.

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