Liquid-liquid direct contact heat exchange using a perfluorocarbon liquid for waste heat recovery (Heat transfer characteristics obtained with perfluorocarbon droplets descending in a hot water medium)

Hideo Inaba, Akihiko Horibe, Koichi Ozaki, Naoki Yokoyama

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

This paper deals with the heat transfer characteristics of a liquid-liquid direct contact operation in which a Perfluorocarbon (PFC) liquid is released in a hot water stream, a low-grade heat source such as urban sewage, for the purpose of heat recovery from it. The paper reports on a set of . experiments in which a PFC liquid (1800kg/m3 at 20°C) was continuously injected from a single, downward-facing nozzle into a slow, upward flow of hot water to be disintegrated into droplets descending in, and thereby heated from the water flow. The results of the experiments show how the size distribution and the translational motions of the droplets affect the overall coefficient for the water-flow-to-droplets heat transfer and also the temperature effectiveness for the droplets.

Original languageEnglish
Pages (from-to)3838-3845
Number of pages8
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume64
Issue number627
Publication statusPublished - Nov 1998
Externally publishedYes

Fingerprint

waste heat
Waste heat utilization
Contacts (fluid mechanics)
heat transfer
recovery
Heat transfer
heat
water flow
Liquids
liquids
water
Water
sewage
Facings
translational motion
Sewage
heat sources
nozzles
grade
Nozzles

Keywords

  • Direct contact heat transfer
  • Heat transfer coefficient
  • Natural convection
  • Perfluorocarbon liquid droplet
  • Temperature effectiveness

ASJC Scopus subject areas

  • Mechanical Engineering
  • Condensed Matter Physics

Cite this

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abstract = "This paper deals with the heat transfer characteristics of a liquid-liquid direct contact operation in which a Perfluorocarbon (PFC) liquid is released in a hot water stream, a low-grade heat source such as urban sewage, for the purpose of heat recovery from it. The paper reports on a set of . experiments in which a PFC liquid (1800kg/m3 at 20°C) was continuously injected from a single, downward-facing nozzle into a slow, upward flow of hot water to be disintegrated into droplets descending in, and thereby heated from the water flow. The results of the experiments show how the size distribution and the translational motions of the droplets affect the overall coefficient for the water-flow-to-droplets heat transfer and also the temperature effectiveness for the droplets.",
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AU - Ozaki, Koichi

AU - Yokoyama, Naoki

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AB - This paper deals with the heat transfer characteristics of a liquid-liquid direct contact operation in which a Perfluorocarbon (PFC) liquid is released in a hot water stream, a low-grade heat source such as urban sewage, for the purpose of heat recovery from it. The paper reports on a set of . experiments in which a PFC liquid (1800kg/m3 at 20°C) was continuously injected from a single, downward-facing nozzle into a slow, upward flow of hot water to be disintegrated into droplets descending in, and thereby heated from the water flow. The results of the experiments show how the size distribution and the translational motions of the droplets affect the overall coefficient for the water-flow-to-droplets heat transfer and also the temperature effectiveness for the droplets.

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KW - Temperature effectiveness

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