Publication detail
INFLUENCE OF WATER TEMPERATURE ON HEAT TRANSFER COEFFICIENT IN SPRAY COOLING OF STEEL SURFACES
CHABIČOVSKÝ, M. RAUDENSKÝ, M. HNÍZDIL, M.
Czech title
Vliv teploty vody na koeficient přestupu tepla při chlazení nerezových povrchů
English title
INFLUENCE OF WATER TEMPERATURE ON HEAT TRANSFER COEFFICIENT IN SPRAY COOLING OF STEEL SURFACES
Type
conference paper
Language
en
Original abstract
Cooling of stainless steel surfaces with flat fan nozzles was studied experimentally. Several configurations of jets and pressures were tested. Tests were done with variable coolant (water) temperatures (20 C , 40 C , 60 C and 80 C). The influence of coolant temperature on the heat transfer coefficient was investigated. An increase in coolant temperature caused a significant decrease of the Leidenfrost temperature (temperature at which the character of boiling is changed – the film boiling is changed into nucleate boiling). Changing the water temperature from 20 C to 80 C caused a change of the Leidenfrost temperature of about 140 C. Furthermore it was observed that in a high temperature region (above Leidenfrost temperature) the heat transfer coefficient has the highest value for the lowest water temperature and for the high coolant temperature (80 C) the cooling intensity is the lowest.
Czech abstract
Bylo studováno chlazení nerezových povrchů plochými tryskami. Byly zkoušeny různé trysky, tlaky a teploty. Testované teploty vody byly 20 C, 40 C, 60 C a 80 C.Byl odpozorován vliv teploty chladícího média (vody) na koeficient přestupu tepla. Vzestup teploty vody způsobil pokles Leidenfrostovi teploty ( teplota při které dojde ke změně charakteru varu – blánový var se změní na bublinový. Změna teploty vody z 20C na 80 C způsobila pokles Leidenfrostovi teploty o 140 C. Dále bylo odpozorováno, že ve vysokoteplotní oblasti (teploty nad Leidenfrostovou teplotou) je hodnota koeficientu přestupu tepla nejvyšší pro nejnižší teplotu vody a nevyšší pro nejnižší teplotu vody.
English abstract
Cooling of stainless steel surfaces with flat fan nozzles was studied experimentally. Several configurations of jets and pressures were tested. Tests were done with variable coolant (water) temperatures (20 C , 40 C , 60 C and 80 C). The influence of coolant temperature on the heat transfer coefficient was investigated. An increase in coolant temperature caused a significant decrease of the Leidenfrost temperature (temperature at which the character of boiling is changed – the film boiling is changed into nucleate boiling). Changing the water temperature from 20 C to 80 C caused a change of the Leidenfrost temperature of about 140 C. Furthermore it was observed that in a high temperature region (above Leidenfrost temperature) the heat transfer coefficient has the highest value for the lowest water temperature and for the high coolant temperature (80 C) the cooling intensity is the lowest.
Keywords in Czech
chlazení, přenos tepla, Leidenfrostova teplota, chlazení horkou vodou
Keywords in English
Spray cooling, Heat Transfer, Leidenfrost temperature, cooling with hot water
RIV year
2012
Released
14.05.2012
Publisher
J. Náprstek, C. Fischer
Location
Svratka
ISBN
978-80-86246-39-0
Book
ENGINEERING MECHANICS 2012
Edition number
18
Pages from–to
126–127
Pages count
408
BIBTEX
@inproceedings{BUT92133,
author="Martin {Chabičovský} and Miroslav {Raudenský} and Milan {Hnízdil},
title="INFLUENCE OF WATER TEMPERATURE ON HEAT TRANSFER COEFFICIENT IN SPRAY COOLING OF STEEL SURFACES",
booktitle="ENGINEERING MECHANICS 2012",
year="2012",
month="May",
pages="126--127",
publisher="J. Náprstek, C. Fischer",
address="Svratka",
isbn="978-80-86246-39-0"
}