Hysteretic phenomena in transition from forced convection to natural convection around a heated cylinder

Hiroshi Suzuki; Yoshiro Iwasaki; Kenji Hara; Yoshihiro Kikuchi

doi:10.1299/kikaib.64.849

Hysteretic phenomena in transition from forced convection to natural convection around a heated cylinder

Hiroshi Suzuki^*
, Yoshiro Iwasaki
, Kenji Hara
, Prabowo
, Yoshihiro Kikuchi

^*Corresponding author for this work

Laboratory of Thermal Engineering and Energy System

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

Abstract

Two-dimensional numerical computations have been conducted to investigate combined forced and natural convection around a cylinder in a cross flow. Reynolds number, Re, ranged between 75 and 150. Rayleigh number, Ra, was changed from 0 to 7×10⁵. Combined convective heat transfer characteristics cannot be expressed by a simple summation of forced and natural convective heat transfer characteristics. An abrupt decrease of mean Nusselt number, Nu_m, is observed in transition from forced convection to natural convection. A hysteresis occurs in the transition region and Nu _m has two different values which depend on initial conditions. This is attributed to subcritical bifurcation of flow behind the cylinder. Nu _m is higher for unsteady flows than for steady flow in such a transition region.

Original language	English
Pages (from-to)	849-855
Number of pages	7
Journal	Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume	64
Issue number	619
DOIs	https://doi.org/10.1299/kikaib.64.849
Publication status	Published - 1998

Keywords

Bifurcation
Combined convection
Convective heat transfer
Hysteresis
Numerical simulation
Transition phenomena

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10.1299/kikaib.64.849

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title = "Hysteretic phenomena in transition from forced convection to natural convection around a heated cylinder",

abstract = "Two-dimensional numerical computations have been conducted to investigate combined forced and natural convection around a cylinder in a cross flow. Reynolds number, Re, ranged between 75 and 150. Rayleigh number, Ra, was changed from 0 to 7×105. Combined convective heat transfer characteristics cannot be expressed by a simple summation of forced and natural convective heat transfer characteristics. An abrupt decrease of mean Nusselt number, Num, is observed in transition from forced convection to natural convection. A hysteresis occurs in the transition region and Nu m has two different values which depend on initial conditions. This is attributed to subcritical bifurcation of flow behind the cylinder. Nu m is higher for unsteady flows than for steady flow in such a transition region.",

keywords = "Bifurcation, Combined convection, Convective heat transfer, Hysteresis, Numerical simulation, Transition phenomena",

author = "Hiroshi Suzuki and Yoshiro Iwasaki and Kenji Hara and Prabowo and Yoshihiro Kikuchi",

year = "1998",

doi = "10.1299/kikaib.64.849",

language = "English",

volume = "64",

pages = "849--855",

journal = "Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B",

issn = "0387-5016",

publisher = "Japan Society of Mechanical Engineers",

number = "619",

}

Hysteretic phenomena in transition from forced convection to natural convection around a heated cylinder. / Suzuki, Hiroshi; Iwasaki, Yoshiro; Hara, Kenji et al.
In: Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 64, No. 619, 1998, p. 849-855.

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

TY - JOUR

T1 - Hysteretic phenomena in transition from forced convection to natural convection around a heated cylinder

AU - Suzuki, Hiroshi

AU - Iwasaki, Yoshiro

AU - Hara, Kenji

AU - Prabowo,

AU - Kikuchi, Yoshihiro

PY - 1998

Y1 - 1998

N2 - Two-dimensional numerical computations have been conducted to investigate combined forced and natural convection around a cylinder in a cross flow. Reynolds number, Re, ranged between 75 and 150. Rayleigh number, Ra, was changed from 0 to 7×105. Combined convective heat transfer characteristics cannot be expressed by a simple summation of forced and natural convective heat transfer characteristics. An abrupt decrease of mean Nusselt number, Num, is observed in transition from forced convection to natural convection. A hysteresis occurs in the transition region and Nu m has two different values which depend on initial conditions. This is attributed to subcritical bifurcation of flow behind the cylinder. Nu m is higher for unsteady flows than for steady flow in such a transition region.

AB - Two-dimensional numerical computations have been conducted to investigate combined forced and natural convection around a cylinder in a cross flow. Reynolds number, Re, ranged between 75 and 150. Rayleigh number, Ra, was changed from 0 to 7×105. Combined convective heat transfer characteristics cannot be expressed by a simple summation of forced and natural convective heat transfer characteristics. An abrupt decrease of mean Nusselt number, Num, is observed in transition from forced convection to natural convection. A hysteresis occurs in the transition region and Nu m has two different values which depend on initial conditions. This is attributed to subcritical bifurcation of flow behind the cylinder. Nu m is higher for unsteady flows than for steady flow in such a transition region.

KW - Bifurcation

KW - Combined convection

KW - Convective heat transfer

KW - Hysteresis

KW - Numerical simulation

KW - Transition phenomena

UR - https://www.scopus.com/pages/publications/77950036439

U2 - 10.1299/kikaib.64.849

DO - 10.1299/kikaib.64.849

M3 - Article

AN - SCOPUS:77950036439

SN - 0387-5016

VL - 64

SP - 849

EP - 855

JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B

JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B

IS - 619

ER -

Hysteretic phenomena in transition from forced convection to natural convection around a heated cylinder

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Keywords

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