Abstract
A series of heat transfer experiments is performed with saturated pure water and sugar/water solution films flowing down on outside surface of a smooth or fluted vertical stainless steel tube near atmospheric pressure. Experimental apparatus is designed and built. Data on length-averaged heat transfer coefficient are presented in a range of Prandtl numbers 2 < Pr < 20 with wall heat fluxes up to 30 kW/m{sub 2}. Results show that the measured heat transfer coefficient does not agree very well with the well-known correlation of Chun and Seban. A new corrected heat transfer correlation is presented. Results with fluted tube are presented and a comparison with smooth tube shows, that the heat transfer is increased slightly more than the increased heat transfer area presumes. Film thickness measurements are carried out by a specially designed probe assembly. Wave frequencies and wave lengths are also determined. According to the measurements the typical wave frequency is about 10-15 Hz near the film distribution device and is rapidly decreasing to the value of about 5 Hz. Measured film thickness and wave velocity show a trend according to some literature correlations
Citation Formats
Haerkoenen, M, Aula, A, and Aittomaeki, A.
Heat transfer and hydrodynamics of falling liquid films.
Finland: N. p.,
1993.
Web.
Haerkoenen, M, Aula, A, & Aittomaeki, A.
Heat transfer and hydrodynamics of falling liquid films.
Finland.
Haerkoenen, M, Aula, A, and Aittomaeki, A.
1993.
"Heat transfer and hydrodynamics of falling liquid films."
Finland.
@misc{etde_10115076,
title = {Heat transfer and hydrodynamics of falling liquid films}
author = {Haerkoenen, M, Aula, A, and Aittomaeki, A}
abstractNote = {A series of heat transfer experiments is performed with saturated pure water and sugar/water solution films flowing down on outside surface of a smooth or fluted vertical stainless steel tube near atmospheric pressure. Experimental apparatus is designed and built. Data on length-averaged heat transfer coefficient are presented in a range of Prandtl numbers 2 < Pr < 20 with wall heat fluxes up to 30 kW/m{sub 2}. Results show that the measured heat transfer coefficient does not agree very well with the well-known correlation of Chun and Seban. A new corrected heat transfer correlation is presented. Results with fluted tube are presented and a comparison with smooth tube shows, that the heat transfer is increased slightly more than the increased heat transfer area presumes. Film thickness measurements are carried out by a specially designed probe assembly. Wave frequencies and wave lengths are also determined. According to the measurements the typical wave frequency is about 10-15 Hz near the film distribution device and is rapidly decreasing to the value of about 5 Hz. Measured film thickness and wave velocity show a trend according to some literature correlations}
place = {Finland}
year = {1993}
month = {Dec}
}
title = {Heat transfer and hydrodynamics of falling liquid films}
author = {Haerkoenen, M, Aula, A, and Aittomaeki, A}
abstractNote = {A series of heat transfer experiments is performed with saturated pure water and sugar/water solution films flowing down on outside surface of a smooth or fluted vertical stainless steel tube near atmospheric pressure. Experimental apparatus is designed and built. Data on length-averaged heat transfer coefficient are presented in a range of Prandtl numbers 2 < Pr < 20 with wall heat fluxes up to 30 kW/m{sub 2}. Results show that the measured heat transfer coefficient does not agree very well with the well-known correlation of Chun and Seban. A new corrected heat transfer correlation is presented. Results with fluted tube are presented and a comparison with smooth tube shows, that the heat transfer is increased slightly more than the increased heat transfer area presumes. Film thickness measurements are carried out by a specially designed probe assembly. Wave frequencies and wave lengths are also determined. According to the measurements the typical wave frequency is about 10-15 Hz near the film distribution device and is rapidly decreasing to the value of about 5 Hz. Measured film thickness and wave velocity show a trend according to some literature correlations}
place = {Finland}
year = {1993}
month = {Dec}
}