0
RESEARCH PAPERS: Forced Convection

Heat Transfer Around a Cylindrical Protuberance Mounted in a Plane Turbulent Boundary Layer

[+] Author and Article Information
Takayuki Tsutsui

Department of Mechanical Engineering, The National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 239-8686, Japan

Masafumi Kawahara

Department of Mechanical Engineering, The National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 239-8686, Japantsutsui@nda.ac.jp

J. Heat Transfer 128(2), 153-161 (Jul 22, 2005) (9 pages) doi:10.1115/1.2136920 History: Received January 31, 2005; Revised July 22, 2005

Heat transfer characteristics around a low aspect ratio cylindrical protuberance placed in a turbulent boundary layer were investigated. The diameters of the protuberance, D, were 40 and 80mm, and the height to diameter aspect ratio HD ranged from 0.125 to 1.0. The Reynolds numbers based on D ranged from 1.1×104 to 1.1×105 and the thickness of the turbulent boundary layer at the protuberance location, δ, ranged from 26 to 120mm for these experiments. In this paper we detail the effects of the boundary layer thickness and the protuberance aspect ratio on heat transfer. The results revealed that the overall heat transfer for the cylindrical protuberance reaches a maximum value when Hδ=0.24.

Copyright © 2006 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Flow geometry and coordinate system

Grahic Jump Location
Figure 2

Velocity distribution and fluctuating velocity for different free-stream velocities on the plane for dt=12mm: (a) velocity distribution and (b) fluctuating velocity

Grahic Jump Location
Figure 3

Experimental models for the heat transfer measurement: (a) constant heat flux model, (b) subheater, (c) thermocouple arrangement, and (d) constant temperature model

Grahic Jump Location
Figure 4

Flow around the cylindrical protuberance (D=80mm, Uo=20m∕s, Re=1.1×105, H∕D=0.5, δ=52mm): (a) front view, (b) rear view, and (c) flow schematic

Grahic Jump Location
Figure 5

Surface oil-flow patterns of the cylindrical protuberance (D=80mm, Uo=20m∕s, Re=1.1×105, δ=52mm): (a) H∕D=1.0, (b) H∕D=0.5, (c) H∕D=0.25, (d) H∕D=0.1875, and (e) H∕D=0.125

Grahic Jump Location
Figure 6

Variation in the reattachment point on the top face

Grahic Jump Location
Figure 7

Nusselt number contours on the top face and side face (D=80mm, Uo=20m∕s, Re=1.1×105): (a) H∕D=1.0, δ=52mm, (b) H∕D=0.5, δ=52mm, (c) H∕D=0.25, δ=52mm, (d) H∕D=0.1875, δ=52mm, (e) H∕D=0.125, δ=52mm, and (f) H∕D=0.25, δ=26mm

Grahic Jump Location
Figure 8

Nusselt number on the centerline of the cylindrical protuberance (D=80mm, Uo=20m∕s, Re=1.1×105, δ=52mm, y=0): (a) H∕D=1.0, (b) H∕D=0.5, (c) H∕D=0.25, (d) H∕D=0.1875, and (e) H∕D=0.125

Grahic Jump Location
Figure 9

The correlation between the average Nusselt number and Re: (a) top face and (b) side face

Grahic Jump Location
Figure 10

The correlation between the average Nusselt number and H∕D: (a) top face and (b) side face

Grahic Jump Location
Figure 11

NurH¯ values: (a) ReH-NurH¯ and (b) H∕D-NurH¯

Grahic Jump Location
Figure 12

The correlation between the average Nusselt number and H∕δ: (a) top face and (b) side face

Grahic Jump Location
Figure 13

Overall Nusselt number: (a) variation with H∕D and (b) a comparison of the present study with a cube and electrical component

Grahic Jump Location
Figure 14

The correlation between Num¯∕Re and H∕δ

Grahic Jump Location
Figure 15

Schematic of the velocity distribution in the boundary layer

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In