Assessment of surfactant-induced Marangoni convection within high-temperature aqueous Lithium-Bromide solution

Niccolo Giannetti, Luca Rametta, Ryota Fukui, Masayoshi Hirasawa, Noriyuki Nishiyama, Seiichi Yamaguchi, Kiyoshi Saito

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A common technical practice to boost the transfer performance of falling film absorbers within absorption cycles relies on surfactant additives for triggering the interfacial turbulence known as Marangoni convection. Given the phenomenon complexity and the interdependencies with other phenomena, such as surface wetting, the assessment of the related enhancement is unresolved yet, and data from previous literature are limited to the operative conditions of single effect refrigerators. This work combines numerical simulations and experiments for evaluating the transfer performance enhancement due to Marangoni convection in a wide operative range encompassing refrigeration and heat pump cycles. Falling film transfer coefficients are measured, with and without n-octanol, with LiBr solution temperature between 50 and 120oC, and specific mass flow rate between 0.011 and 0.11Kg·m-1s-1. Consequently, a semi-empirical model estimates the contribution of improved wettability and consequently indicates the portion of the transfer enhancement related to the Marangoni convection.

Original languageEnglish
Title of host publication14th IIR Gustav-Lorentzen Conference on Natural Fluids, GL 2020 - Proceedings
PublisherInternational Institute of Refrigeration
Pages97-102
Number of pages6
ISBN (Electronic)9782362150401
DOIs
Publication statusPublished - 2020
Event14th IIR Gustav-Lorentzen Conference on Natural Fluids, GL 2020 - Virtual, Kyoto, Japan
Duration: 2020 Dec 72020 Dec 9

Publication series

NameRefrigeration Science and Technology
Volume2020-December
ISSN (Print)0151-1637

Conference

Conference14th IIR Gustav-Lorentzen Conference on Natural Fluids, GL 2020
CountryJapan
CityVirtual, Kyoto
Period20/12/720/12/9

Keywords

  • Absorption
  • High Temperature
  • Marangoni Convection
  • N-Octanol

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Condensed Matter Physics

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