Transient free convection in a rectangular water-filled enclosure

Vadim Dubovsky, Yonatan Kugler, Nimrod Maoz, Ruth Letan

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Transient laminar free convection in a water-filled rectangular enclosure has been studied experimentally and numerically. The study aimed at gaining an insight into the physical phenomena, illustrated by the flow patterns and the temperature stratification, from the initial stage of a homogeneous fluid through the transient evolving process. The experimental setup consisted of two rectangular water-filled enclosures: the smaller one contained a heat source and was centrally immersed in the larger one. Dye was injected for visualization of the rising boundary layer over the inner container walls, and the accumulation of the colored layers in the upper zone of the outer container. Simultaneously, the temperature measurements, by thermocouples and an infra-red camera, displayed the formation of a stratified structure. The numerical study was conducted three-dimensionally, using the Fluent 6.3 software. The stratified temperature field, observed experimentally, was well-predicted by the numerical model. The heat transfer rates and the transient averaged Nusselt numbers were compared with the data in the literature. The current, constant power input yielded Nu/Ra0.25∼0.7 in the range of Fo/Ra0.25 = 0-3.

Original languageEnglish
Title of host publicationEngineering Systems; Heat Transfer and Thermal Engineering; Materials and Tribology; Mechatronics; Robotics
PublisherWeb Portal ASME (American Society of Mechanical Engineers)
ISBN (Electronic)9780791845851
DOIs
StatePublished - 1 Jan 2014
EventASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis, ESDA 2014 - Copenhagen, Denmark
Duration: 25 Jul 201427 Jul 2014

Publication series

NameASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis, ESDA 2014
Volume3

Conference

ConferenceASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis, ESDA 2014
Country/TerritoryDenmark
CityCopenhagen
Period25/07/1427/07/14

Keywords

  • Experimental
  • Free convection
  • Rectangular enclosure
  • Simulation
  • Transient
  • Water

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