Natural convection between two horizontal cylinders inside a circular enclosure subjected to external convection

Ching-Jenq Ho, Y. T. Cheng, C. C. Wang

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

This paper presents a numerical study, supplemented with experiments of flow visualization and holographic interferometric measurement, concerning the buoyancy-induced fluid flow and heat transfer between two horizontal, differentially heated cylinders inside a circular, air-filled enclosure subjected to external convection. Numerical simulations via a finite-difference method have been conducted mainly to investigate the effect of insulation (namely, the external convection boundary condition) at the circular enclosure wall on the buoyant air flow structure and heat transfer characteristics among the horizontal cylinders and the circular enclosure wall. The results are displayed graphically to emphasize the effects of the Rayleigh number (Ra = 104∼107), the inclination angle of the enclosure with respect to gravity (φg = 30, 60, 90°) and the gap width between the horizontal cylinders (s/d = 0.7, 0.8333, 1.0) in the presence of external convection. The external convection at the circular enclosure wall was found to further promote buoyant convection flow and a markedly enhanced heat transfer between the cylinders accordingly results. In addition, the simulation taking account for the external convection at the enclosure wall was found to compare favorably with the experimental results of flow visualization and temperature distribution in a test cell with imperfect thermal insulation.

Original languageEnglish
Pages (from-to)299-306
Number of pages8
JournalInternational Journal of Heat and Fluid Flow
Volume15
Issue number4
DOIs
Publication statusPublished - 1994 Jan 1

Fingerprint

enclosure
Enclosures
Natural convection
free convection
convection
heat transfer
flow visualization
Flow visualization
Heat transfer
thermal insulation
Thermal insulation
air flow
Flow structure
Rayleigh number
Engine cylinders
Air
Buoyancy
buoyancy
Finite difference method
insulation

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

@article{1f13f6e1327c422dbfb491f6dd04dd1c,
title = "Natural convection between two horizontal cylinders inside a circular enclosure subjected to external convection",
abstract = "This paper presents a numerical study, supplemented with experiments of flow visualization and holographic interferometric measurement, concerning the buoyancy-induced fluid flow and heat transfer between two horizontal, differentially heated cylinders inside a circular, air-filled enclosure subjected to external convection. Numerical simulations via a finite-difference method have been conducted mainly to investigate the effect of insulation (namely, the external convection boundary condition) at the circular enclosure wall on the buoyant air flow structure and heat transfer characteristics among the horizontal cylinders and the circular enclosure wall. The results are displayed graphically to emphasize the effects of the Rayleigh number (Ra = 104∼107), the inclination angle of the enclosure with respect to gravity (φg = 30, 60, 90°) and the gap width between the horizontal cylinders (s/d = 0.7, 0.8333, 1.0) in the presence of external convection. The external convection at the circular enclosure wall was found to further promote buoyant convection flow and a markedly enhanced heat transfer between the cylinders accordingly results. In addition, the simulation taking account for the external convection at the enclosure wall was found to compare favorably with the experimental results of flow visualization and temperature distribution in a test cell with imperfect thermal insulation.",
author = "Ching-Jenq Ho and Cheng, {Y. T.} and Wang, {C. C.}",
year = "1994",
month = "1",
day = "1",
doi = "10.1016/0142-727X(94)90015-9",
language = "English",
volume = "15",
pages = "299--306",
journal = "International Journal of Heat and Fluid Flow",
issn = "0142-727X",
publisher = "Elsevier",
number = "4",

}

Natural convection between two horizontal cylinders inside a circular enclosure subjected to external convection. / Ho, Ching-Jenq; Cheng, Y. T.; Wang, C. C.

In: International Journal of Heat and Fluid Flow, Vol. 15, No. 4, 01.01.1994, p. 299-306.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Natural convection between two horizontal cylinders inside a circular enclosure subjected to external convection

AU - Ho, Ching-Jenq

AU - Cheng, Y. T.

AU - Wang, C. C.

PY - 1994/1/1

Y1 - 1994/1/1

N2 - This paper presents a numerical study, supplemented with experiments of flow visualization and holographic interferometric measurement, concerning the buoyancy-induced fluid flow and heat transfer between two horizontal, differentially heated cylinders inside a circular, air-filled enclosure subjected to external convection. Numerical simulations via a finite-difference method have been conducted mainly to investigate the effect of insulation (namely, the external convection boundary condition) at the circular enclosure wall on the buoyant air flow structure and heat transfer characteristics among the horizontal cylinders and the circular enclosure wall. The results are displayed graphically to emphasize the effects of the Rayleigh number (Ra = 104∼107), the inclination angle of the enclosure with respect to gravity (φg = 30, 60, 90°) and the gap width between the horizontal cylinders (s/d = 0.7, 0.8333, 1.0) in the presence of external convection. The external convection at the circular enclosure wall was found to further promote buoyant convection flow and a markedly enhanced heat transfer between the cylinders accordingly results. In addition, the simulation taking account for the external convection at the enclosure wall was found to compare favorably with the experimental results of flow visualization and temperature distribution in a test cell with imperfect thermal insulation.

AB - This paper presents a numerical study, supplemented with experiments of flow visualization and holographic interferometric measurement, concerning the buoyancy-induced fluid flow and heat transfer between two horizontal, differentially heated cylinders inside a circular, air-filled enclosure subjected to external convection. Numerical simulations via a finite-difference method have been conducted mainly to investigate the effect of insulation (namely, the external convection boundary condition) at the circular enclosure wall on the buoyant air flow structure and heat transfer characteristics among the horizontal cylinders and the circular enclosure wall. The results are displayed graphically to emphasize the effects of the Rayleigh number (Ra = 104∼107), the inclination angle of the enclosure with respect to gravity (φg = 30, 60, 90°) and the gap width between the horizontal cylinders (s/d = 0.7, 0.8333, 1.0) in the presence of external convection. The external convection at the circular enclosure wall was found to further promote buoyant convection flow and a markedly enhanced heat transfer between the cylinders accordingly results. In addition, the simulation taking account for the external convection at the enclosure wall was found to compare favorably with the experimental results of flow visualization and temperature distribution in a test cell with imperfect thermal insulation.

UR - http://www.scopus.com/inward/record.url?scp=0028486592&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0028486592&partnerID=8YFLogxK

U2 - 10.1016/0142-727X(94)90015-9

DO - 10.1016/0142-727X(94)90015-9

M3 - Article

AN - SCOPUS:0028486592

VL - 15

SP - 299

EP - 306

JO - International Journal of Heat and Fluid Flow

JF - International Journal of Heat and Fluid Flow

SN - 0142-727X

IS - 4

ER -