Negatively buoyant plume flow in a baffled heat exchanger

Sandra K S Boetcher; F. A. Kulacki; Jane H. Davidson

doi:10.1115/1.4001471

Negatively buoyant plume flow in a baffled heat exchanger

Sandra K S Boetcher, F. A. Kulacki, Jane H. Davidson

Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

A numerical simulation of transient two-dimensional negatively buoyant flow into a straight baffle situated below an isothermal circular cylinder in an initially isothermal enclosure is presented for both an adiabatic and a highly conducting baffle for Rayleigh numbers from 10⁶ to 10⁷. Results show the effects of baffle offset, width, and length on the point where viscous flow develops and on velocity profiles within the baffle. Results are interpreted to guide the design of straight baffles to reduce destruction of stratification in thermal stores using an immersed heat exchanger. The preferred geometry is a low-conductivity baffle of width equal to the effective width of the heat exchanger and 15 or more cylinder diameters in length to ensure nearly fully developed flow at the baffle outlet.

Original language	English (US)
Pages (from-to)	345021-345027
Number of pages	7
Journal	Journal of Solar Energy Engineering, Transactions of the ASME
Volume	132
Issue number	3
DOIs	https://doi.org/10.1115/1.4001471
State	Published - Aug 2010

Keywords

Immersed heat exchanger
Negatively buoyant flow
Thermal stores

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AB - A numerical simulation of transient two-dimensional negatively buoyant flow into a straight baffle situated below an isothermal circular cylinder in an initially isothermal enclosure is presented for both an adiabatic and a highly conducting baffle for Rayleigh numbers from 106 to 107. Results show the effects of baffle offset, width, and length on the point where viscous flow develops and on velocity profiles within the baffle. Results are interpreted to guide the design of straight baffles to reduce destruction of stratification in thermal stores using an immersed heat exchanger. The preferred geometry is a low-conductivity baffle of width equal to the effective width of the heat exchanger and 15 or more cylinder diameters in length to ensure nearly fully developed flow at the baffle outlet.

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Negatively buoyant plume flow in a baffled heat exchanger

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