Penetrative natural convection flow due to an isothermal vertical surface immersed in a thermally stable two-layer environment

Kamiesh Kapoor, Yogesh Jaluria

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

Abstract

An experimental investigation has been carried out on the penetrative natural convection flow over and the resulting thermal transport from an isothermal vertical surface immersed in a thermally stable, two-layer, ambient medium, in which an essentially isothermal heated layer overlies a relatively cooler isothermal layer of the same fluid. This flow is frequently encountered in many practical problems of interest, such as heat rejection, energy storage and enclosure fires. However, not much work has been done on such penetrative convection problems. In the present study, an isothermal vertical plate is exposed to an extensive two-layer thermally stable environment, resulting in a natural convection flow adjacent to the surface due to the temperature differences that exist. Detailed measurements of the thermal field are carried out for several surface temperatures and the corresponding isotherms obtained to characterize the penetration of the wall flow. The surface temperature is taken as lower than the upper layer temperature in this study so that a downward natural convection flow is generated adjacent to the surface in the upper zone. If the wall temperature is equal to the lower layer temperature, it is found that the natural convective wall flow penetrates into the lower cooler region, becomes negatively buoyant and then rises toward the interface between the two layers. It again becomes negatively buoyant in the upper zone, drops down toward the interface and finally flows outward, away from the vertical surface, staying close to the interface. Velocity and temperature profiles are measured at the interface of the two-layer environment and the mass flow rate penetrating downward across the interface as well as that penetrating into the upper zone are estimated.

Original languageEnglish (US)
Title of host publicationFundamentals of Natural Convection
PublisherPubl by ASME
Pages65-72
Number of pages8
ISBN (Print)0791808300
StatePublished - Dec 1 1991
EventWinter Annual Meeting of the American Society of Mechanical Engineers - Atlanta, GA, USA
Duration: Dec 1 1991Dec 6 1991

Publication series

NameAmerican Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
Volume178
ISSN (Print)0272-5673

Other

OtherWinter Annual Meeting of the American Society of Mechanical Engineers
CityAtlanta, GA, USA
Period12/1/9112/6/91

Fingerprint

Natural convection
Wall flow
Temperature
Enclosures
Energy storage
Isotherms
Fires
Flow rate
Fluids
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

Kapoor, K., & Jaluria, Y. (1991). Penetrative natural convection flow due to an isothermal vertical surface immersed in a thermally stable two-layer environment. In Fundamentals of Natural Convection (pp. 65-72). (American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD; Vol. 178). Publ by ASME.
Kapoor, Kamiesh ; Jaluria, Yogesh. / Penetrative natural convection flow due to an isothermal vertical surface immersed in a thermally stable two-layer environment. Fundamentals of Natural Convection. Publ by ASME, 1991. pp. 65-72 (American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD).
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Kapoor, K & Jaluria, Y 1991, Penetrative natural convection flow due to an isothermal vertical surface immersed in a thermally stable two-layer environment. in Fundamentals of Natural Convection. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, vol. 178, Publ by ASME, pp. 65-72, Winter Annual Meeting of the American Society of Mechanical Engineers, Atlanta, GA, USA, 12/1/91.

Penetrative natural convection flow due to an isothermal vertical surface immersed in a thermally stable two-layer environment. / Kapoor, Kamiesh; Jaluria, Yogesh.

Fundamentals of Natural Convection. Publ by ASME, 1991. p. 65-72 (American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD; Vol. 178).

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

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Kapoor K, Jaluria Y. Penetrative natural convection flow due to an isothermal vertical surface immersed in a thermally stable two-layer environment. In Fundamentals of Natural Convection. Publ by ASME. 1991. p. 65-72. (American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD).