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Heat transfer and hydrodynamics of falling liquid films

Technical Report:

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
Publication Date:
Dec 31, 1993
Product Type:
Technical Report
Report Number:
TTKK-LT-93
Reference Number:
SCA: 420400; PA: FI-95:003087; EDB-95:030704; SN: 95001320439
Resource Relation:
Other Information: PBD: 1993
Subject:
42 ENGINEERING; FILM FLOW; HEAT TRANSFER; HYDRODYNAMICS; TURBULENT FLOW; LAMINAR FLOW; TUBES; LIQUIDS; REYNOLDS NUMBER; THIN FILMS; 420400; HEAT TRANSFER AND FLUID FLOW
OSTI ID:
10115076
Research Organizations:
Tampere Univ. of Technology (Finland). Thermal Engineering
Country of Origin:
Finland
Language:
English
Other Identifying Numbers:
Other: ON: DE95737625; ISBN 951-722-079-0; TRN: FI9503087
Availability:
OSTI; NTIS
Submitting Site:
FI
Size:
72 p.
Announcement Date:
Jun 30, 2005

Technical Report:

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}
}