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

研究成果: Conference contribution

抄録

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.

本文言語English
ホスト出版物のタイトル14th IIR Gustav-Lorentzen Conference on Natural Fluids, GL 2020 - Proceedings
出版社International Institute of Refrigeration
ページ97-102
ページ数6
ISBN(電子版)9782362150401
DOI
出版ステータスPublished - 2020
イベント14th IIR Gustav-Lorentzen Conference on Natural Fluids, GL 2020 - Virtual, Kyoto, Japan
継続期間: 2020 12 72020 12 9

出版物シリーズ

名前Refrigeration Science and Technology
2020-December
ISSN(印刷版)0151-1637

Conference

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

ASJC Scopus subject areas

  • 制御およびシステム工学
  • 電子工学および電気工学
  • 機械工学
  • 凝縮系物理学

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