Natural convection from a tube bundle in a thin inclined enclosure

Wei Liu; Jane H. Davidson; F. A. Kulacki

doi:10.1115/IMECE2003-55543

Natural convection from a tube bundle in a thin inclined enclosure

Wei Liu, Jane H. Davidson, F. A. Kulacki

Mechanical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

2 Scopus citations

Abstract

Natural convection heat transfer coefficients for a rectangular array of eight tubes contained in a thin enclosure of aspect ratio 9.3:1 and inclined at 30 degrees to the horizontal are measured for a range of transient operating modes typical of a load side heat exchanger in unpressurized integral collector-storage systems. Water is the working fluid, and thermal charging is accomplished via a constant heat flux on the upper boundary. All other boundaries are well insulated. Results for isothermal and stratified enclosures yield the following correlation for the overall Nusselt number: Nu_D = (0.728 ± 0.002)Ra_D^0.25, 4.0 × 10⁵ ≤ Ra_D ≤ 1.4 × 10⁷. The flow field in the enclosure is inferred from measured temperature distributions. The temperature difference that drives natural convection is also determined. The results extend earlier work for the case of a single tube and provide limiting case heat transfer data for a tube bundle that occupies the upper portion of the collector storage system.

Original language	English (US)
Title of host publication	American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
Publisher	American Society of Mechanical Engineers (ASME)
Pages	71-78
Number of pages	8
Volume	374
Edition	3
DOIs	https://doi.org/10.1115/IMECE2003-55543
State	Published - 2003
Event	2003 ASME International Mechanical Engineering Congress - Washington, DC., United States Duration: Nov 15 2003 → Nov 21 2003

Other

Other	2003 ASME International Mechanical Engineering Congress
Country/Territory	United States
City	Washington, DC.
Period	11/15/03 → 11/21/03

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Liu, W, Davidson, JH & Kulacki, FA 2003, Natural convection from a tube bundle in a thin inclined enclosure. in American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD. 3 edn, vol. 374, American Society of Mechanical Engineers (ASME), pp. 71-78, 2003 ASME International Mechanical Engineering Congress, Washington, DC., United States, 11/15/03. https://doi.org/10.1115/IMECE2003-55543

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title = "Natural convection from a tube bundle in a thin inclined enclosure",

abstract = "Natural convection heat transfer coefficients for a rectangular array of eight tubes contained in a thin enclosure of aspect ratio 9.3:1 and inclined at 30 degrees to the horizontal are measured for a range of transient operating modes typical of a load side heat exchanger in unpressurized integral collector-storage systems. Water is the working fluid, and thermal charging is accomplished via a constant heat flux on the upper boundary. All other boundaries are well insulated. Results for isothermal and stratified enclosures yield the following correlation for the overall Nusselt number: NuD = (0.728 ± 0.002)RaD0.25, 4.0 × 105 ≤ RaD ≤ 1.4 × 107. The flow field in the enclosure is inferred from measured temperature distributions. The temperature difference that drives natural convection is also determined. The results extend earlier work for the case of a single tube and provide limiting case heat transfer data for a tube bundle that occupies the upper portion of the collector storage system.",

author = "Wei Liu and Davidson, {Jane H.} and Kulacki, {F. A.}",

year = "2003",

doi = "10.1115/IMECE2003-55543",

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publisher = "American Society of Mechanical Engineers (ASME)",

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note = "2003 ASME International Mechanical Engineering Congress ; Conference date: 15-11-2003 Through 21-11-2003",

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T1 - Natural convection from a tube bundle in a thin inclined enclosure

AU - Liu, Wei

AU - Davidson, Jane H.

AU - Kulacki, F. A.

PY - 2003

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N2 - Natural convection heat transfer coefficients for a rectangular array of eight tubes contained in a thin enclosure of aspect ratio 9.3:1 and inclined at 30 degrees to the horizontal are measured for a range of transient operating modes typical of a load side heat exchanger in unpressurized integral collector-storage systems. Water is the working fluid, and thermal charging is accomplished via a constant heat flux on the upper boundary. All other boundaries are well insulated. Results for isothermal and stratified enclosures yield the following correlation for the overall Nusselt number: NuD = (0.728 ± 0.002)RaD0.25, 4.0 × 105 ≤ RaD ≤ 1.4 × 107. The flow field in the enclosure is inferred from measured temperature distributions. The temperature difference that drives natural convection is also determined. The results extend earlier work for the case of a single tube and provide limiting case heat transfer data for a tube bundle that occupies the upper portion of the collector storage system.

AB - Natural convection heat transfer coefficients for a rectangular array of eight tubes contained in a thin enclosure of aspect ratio 9.3:1 and inclined at 30 degrees to the horizontal are measured for a range of transient operating modes typical of a load side heat exchanger in unpressurized integral collector-storage systems. Water is the working fluid, and thermal charging is accomplished via a constant heat flux on the upper boundary. All other boundaries are well insulated. Results for isothermal and stratified enclosures yield the following correlation for the overall Nusselt number: NuD = (0.728 ± 0.002)RaD0.25, 4.0 × 105 ≤ RaD ≤ 1.4 × 107. The flow field in the enclosure is inferred from measured temperature distributions. The temperature difference that drives natural convection is also determined. The results extend earlier work for the case of a single tube and provide limiting case heat transfer data for a tube bundle that occupies the upper portion of the collector storage system.

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PB - American Society of Mechanical Engineers (ASME)

T2 - 2003 ASME International Mechanical Engineering Congress

Y2 - 15 November 2003 through 21 November 2003

ER -

Natural convection from a tube bundle in a thin inclined enclosure

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