THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

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Chao Luo

,

Jun Zhao

,

Weibin Ma

HEAT-TRANSFER CHARACTERISTICS OF AMMONIA-WATER FALLING FILM GENERATION OUTSIDE A VERTICAL TUBE

ABSTRACT
A heat transfer experimental of vertical out-tube falling film was conducted with different inlet spray density of ammonia-water solution and inlet hot water temperature. The inlet liquid mass concentration was selected as 60% of ammonia. The experiments showed that the overall heat transfer coefficient increases with the increase of inlet spray density and a maximum overall heat transfer coefficient could be obtained in an optimum spray density of ammonia-water solution, Γ, between 0.26 and 0.29 kg/ms. The generation of ammonia vapor outside the vertical falling film had a similar trend with the overall heat transfer coefficient basing on different spray density. The effect of hot water temperature difference, ΔT, on overall heat transfer coefficient showed that ΔT between 10 and 13 K is the optimum temperature difference of the vertical falling film generation
KEYWORDS
heat transfer performance, vertical falling film, generation, ammonia water solution
PAPER SUBMITTED: 2015-05-15
PAPER REVISED: 2015-09-25
PAPER ACCEPTED: 2015-11-23
PUBLISHED ONLINE: 2015-12-13
DOI REFERENCE: https://doi.org/10.2298/TSCI150515183L
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2017, VOLUME 21, ISSUE Issue 3, PAGES [1251 - 1259]
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Heat-transfer characteristics of ammonia-water falling film generation outside a vertical tube

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence