Instability and heat transfer in mixed convection flow in a horizontal duct with discrete heat sources

Qinghua Wang; Yogesh Jaluria

Instability and heat transfer in mixed convection flow in a horizontal duct with discrete heat sources

Qinghua Wang, Yogesh Jaluria

Engn - Mech & Aerospace Engn

Research output: Contribution to journal › Conference article › peer-review

2 Scopus citations

Abstract

Three dimensional mixed convection flow in a horizontal rectangular duct at low Reynolds numbers 5 ≤ Re ≤ 100 has been investigated numerically. Multiple strip heat sources are flushed-mounted on the bottom surface, modeling IC chips on PCBs. Two different flow patterns were observed. For Re ≥ 20, and Gr ≤ 1.5 × 10 ⁴, only steady longitudinal rolls appear in the channel. The discontinuous deployment of heat sources on the bottom makes the longitudinal rolls expand and shrink periodically. The unsteady flow consists of steady longitudinal rolls near the side walls and traveling transverse rolls at the core region of the channel. The traveling velocity of the transverse rolls was found to be equal to the mean velocity of the forced flow. The implications of these observations to the cooling of electronic equipment are discussed.

Original language	English (US)
Pages (from-to)	13-25
Number of pages	13
Journal	American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
Volume	369
Issue number	7
State	Published - 2001
Event	2001 ASME International Mechanical Engineering Congress and Exposition - New York, NY, United States Duration: Nov 11 2001 → Nov 16 2001

All Science Journal Classification (ASJC) codes

Mechanical Engineering
Fluid Flow and Transfer Processes

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title = "Instability and heat transfer in mixed convection flow in a horizontal duct with discrete heat sources",

abstract = "Three dimensional mixed convection flow in a horizontal rectangular duct at low Reynolds numbers 5 ≤ Re ≤ 100 has been investigated numerically. Multiple strip heat sources are flushed-mounted on the bottom surface, modeling IC chips on PCBs. Two different flow patterns were observed. For Re ≥ 20, and Gr ≤ 1.5 × 10 4, only steady longitudinal rolls appear in the channel. The discontinuous deployment of heat sources on the bottom makes the longitudinal rolls expand and shrink periodically. The unsteady flow consists of steady longitudinal rolls near the side walls and traveling transverse rolls at the core region of the channel. The traveling velocity of the transverse rolls was found to be equal to the mean velocity of the forced flow. The implications of these observations to the cooling of electronic equipment are discussed.",

author = "Qinghua Wang and Yogesh Jaluria",

year = "2001",

language = "English (US)",

volume = "369",

pages = "13--25",

journal = "American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD",

issn = "0272-5673",

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

number = "7",

note = "2001 ASME International Mechanical Engineering Congress and Exposition ; Conference date: 11-11-2001 Through 16-11-2001",

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TY - JOUR

T1 - Instability and heat transfer in mixed convection flow in a horizontal duct with discrete heat sources

AU - Wang, Qinghua

AU - Jaluria, Yogesh

PY - 2001

Y1 - 2001

N2 - Three dimensional mixed convection flow in a horizontal rectangular duct at low Reynolds numbers 5 ≤ Re ≤ 100 has been investigated numerically. Multiple strip heat sources are flushed-mounted on the bottom surface, modeling IC chips on PCBs. Two different flow patterns were observed. For Re ≥ 20, and Gr ≤ 1.5 × 10 4, only steady longitudinal rolls appear in the channel. The discontinuous deployment of heat sources on the bottom makes the longitudinal rolls expand and shrink periodically. The unsteady flow consists of steady longitudinal rolls near the side walls and traveling transverse rolls at the core region of the channel. The traveling velocity of the transverse rolls was found to be equal to the mean velocity of the forced flow. The implications of these observations to the cooling of electronic equipment are discussed.

AB - Three dimensional mixed convection flow in a horizontal rectangular duct at low Reynolds numbers 5 ≤ Re ≤ 100 has been investigated numerically. Multiple strip heat sources are flushed-mounted on the bottom surface, modeling IC chips on PCBs. Two different flow patterns were observed. For Re ≥ 20, and Gr ≤ 1.5 × 10 4, only steady longitudinal rolls appear in the channel. The discontinuous deployment of heat sources on the bottom makes the longitudinal rolls expand and shrink periodically. The unsteady flow consists of steady longitudinal rolls near the side walls and traveling transverse rolls at the core region of the channel. The traveling velocity of the transverse rolls was found to be equal to the mean velocity of the forced flow. The implications of these observations to the cooling of electronic equipment are discussed.

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M3 - Conference article

AN - SCOPUS:1542537712

VL - 369

SP - 13

EP - 25

JO - American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD

JF - American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD

SN - 0272-5673

IS - 7

T2 - 2001 ASME International Mechanical Engineering Congress and Exposition

Y2 - 11 November 2001 through 16 November 2001

ER -

Instability and heat transfer in mixed convection flow in a horizontal duct with discrete heat sources

Abstract

All Science Journal Classification (ASJC) codes

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