Plastics. Determination of the effects of exposure to damp heat, water spray and salt mist

2015 ◽  
Keyword(s):  
Water Spray

Implementation of the Axially Symmetrical and Three Dimensional Finite Element Models to the Determination of the Heat Transfer Coefficient Distribution on the Hot Plate Surface Cooled by the Water Spray Nozzle

2012 ◽  
Vol 504-506 ◽  
pp. 1055-1060 ◽  
Author(s):  
Zbigniew Malinowski ◽  
Tadeusz Telejko ◽  
Beata Hadala ◽  
Agnieszka Cebo-Rudnicka
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Three Dimensional ◽  
Spray Nozzle ◽  
Water Spray ◽  
Coefficient Distribution ◽  
The Heat Transfer Coefficient ◽  
Material Temperature

Plate and strip hot rolling lines are equipped with water cooling systems used to control the deformed material temperature. This system has a great importance in the case of thermal - mechanical deformation of steel which is focused on formation a proper microstructure and mechanical properties. The desired rate of cooling is achieved by water spray or laminar cooling applied to the hot surface of a strip. The water flow rate and pressure can be changed in a wide range and it will result in a very different heat transfer from the cooled material to the cooling water. The suitable cooling rate and the deformed material temperature can be determined based on numerical simulations. In this case thermal boundary conditions have to be specified on the cooled surface. The determination of the heat transfer coefficient distribution in the area of the water spray nozzle would improve numerical simulations significantly. In the paper an attempt is made to determine the heat transfer coefficient distribution on the hot plate surface cooled by the water spray nozzle. In the inverse method direct axially symmetrical and three dimensional solutions to the plate temperature field have been implemented. The computation time and the achieved accuracy have been compared for five cases. The studied cases differed in the maximum value of the heat transfer coefficient in nozzle spray axis and its distribution in the cooling time.

Heat Transfers Coefficients of Directly and Indirectly Cooled Component Areas during Air-Water Spray Cooling

2020 ◽  
Vol 76 (1) ◽  
pp. 64-75
Author(s):  
C. Kahra ◽  
F. Nürnberger ◽  
H. J. Maier ◽  
S. Herbst
Keyword(s):  
Heat Transfer ◽  
Spray Cooling ◽  
Measured Temperature ◽  
Water Spray ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Heat Transfers ◽  
Temperature Time ◽  
Water Spray Cooling

Abstract For the determination of heat transfer coefficients in air-water spray cooling, two methods are presented that are capable of characterizing multi-nozzle cooling set-ups. The methods are based on the quenching of thin-walled tubes or massive cylinders on which cooling curves are recorded at given positions with thermocouples. The temperature dependent heat transfer coefficients were calculated by an inverse calculation and the measured temperature-time-curves could be reproduced with these data in numerical cooling simulations. Next, the determined heat transfer coefficients were used for the calculation of an air-water-spray quenching process of a forging part with more challenging geometry. The calculated results were compared with thermocouple measurements. Different calculation variants for the heat transfer on component surfaces not directly exposed to the air-water spray are shown and discussed. ◼

scholarly journals Determination of effective heat transfer coefficient for water spray cooling of steel

2020 ◽  
Vol 50 ◽  
pp. 488-491
Author(s):  
Sampo Uusikallio ◽  
Sami Koskenniska ◽  
Joonas Ilmola ◽  
Jussi Paavola ◽  
Aarne Pohjonen ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Spray Cooling ◽  
Water Spray ◽  
Effective Heat ◽  
Effective Heat Transfer Coefficient ◽  
Water Spray Cooling
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