Sage Journals: Discover world-class research

Abstract

This work experimentally investigates temperature distributions of RBCs (rotating blade couplings) using circumferentially installed ribbed turbulators in real-time 4WD (four-wheel-drive) vehicles. Three types of circumferential rib turbulators are designed and installed in the RBC's inner rotating cylinder. These add to the area over which heat is transferred and prevent the generation of Taylor vorticity. A test rig is designed to make the key dimensionless parameters closely approximate the operating conditions of a real 4WD vehicle. The local temperature distributions in the axial and circumferential directions of a RBC with circumferentially ribbed turbulators, were measured and compared with those in smooth walls. Under the experimental conditions, the range of the rotational Reynolds numbers is 8.55≤Re_Ω≤ 34.20. Results indicate the ribbed design with aspect ratio 2.5 (7.5 mm wide and 3 mm high) yields temperature distributions with the least variation that is the highest heat transfer among the three types of circumferential ribs. This study ultimately aims to find an effective design methodology that improves the temperature distribution of RBCs with circumferentially ribbed turbulators in a real-time 4WD vehicle. Finally, experimental results for circumferentially ribbed turbulators with three aspect ratios were empirically correlated.

Keywords

RBCs 4WD circumferentially ribbed turbulators

Get full access to this article

View all access options for this article.

References

Schlichting

Boundary layer theory, 7th edition, 1979, pp. 335 and 714 (McGraw-Hill, New York).

Lin

Faghri

Heat transfer analysis of stratified flow in rotating heat pipes with cylindrical and stepped walls, Int. J. Heat Mass Transf., 1997, 40, 4393–4404.

Yarin

A. L.

Gelfgat

A. Y.

Yoseph

P. Z. B.

Enhancement of mass transfer in a two-layer Taylor- Couette apparatus with axial flow, Int. J. Heat Mass Transf., 2001, 45, 555–570.

Raspo

Arco

E. C. D.

Instability in a rotating channel-cavity system with an axial through-flow, In. J. Heat Fluid Flow, 2003, 24, 41–53.

Yang

W. J.

Fann

Kim

J. H.

Heat and fluid flow inside rotating channels, Appl. Mech. Rev., 1994, 47 (8), 367–396.

Taylor

G. I.

Stability of a viscous fluid contained between two rotating cylinders, Phil. Trans. Royal Soc. London, 1923, A233, 289–343.

Attili

B. S.

A direct method to investigate the stability of flow in a narrow gap between two rotating cylinders, Energy Convers. Manag., 1999, 40, 459–466.

Rudolph

Shinbrot

Lueptow

R. M.

A model of mixing and transport in wavy Taylor-Couette flow, Phys. D., 1998, 121, 163–174.

Han

J. C.

Heat transfer and friction in channels with two opposite rib-roughened walls, ASME J. Heat Mass Transf. 1984, 106, 774–781.

10.

Han

J. C.

Park

J. S.

Lei

C. K.

Heat transfer enhancement in channels with turbulence promoters, J. Eng. Gas Turbines Powers, 1985, 107, 629–635.

11.

Chandra

P. R.

Alexander

C. R.

Han

J. C.

Heat transfer and friction behaviors in rectangular channels with varying number of ribbed walls, Int. J. Heat Mass Transf., 2003, 46, 481–495.

12.

Chang

S. W.

L. M.

Yang

T. L.

Enhanced heat transfer with full circumferential ribs in helical pipe. In

The First International Symposium on Thermal Science and Engineering, Beijing, 2002, 240–250.

13.

Hwang

G. J.

Tzeng

S. C.

Mao

C. P.

Soong

C. Y.

Heat transfer in a radially rotating four-pass serpentine channel with staggered half-V ribbed turbulators, ASME J. Heat Transf., 2001, 123, 39–50.

14.

Kline

S. J.

McClintock

F. A.

Describing uncertainties in single sample experiments. Mech. Eng., 1953, January, 3–8.

15.

Mohanty

A. K.

Tawfek

A. A.

Prasad

B. V.S.S.S.

Heat transfer from a rotating cylinder in crossflow, Exp., Therm. Fluid Sci., 1995, 10, 54–61.

16.

Prasad

B. V.S.S.S.

Tawfek

A. A.

Mohanty

A. K.

Heat transfer from a circular cylinder rotating about an orthogonal axis in quiescent air, Exp. Therm. Fluid Sci., 1991, 10, 267–272.

Experimental study of local temperature distributions in rotary blade couplings of four-wheel-drive vehicles with circumferentially ribbed turbulators

Abstract

Abstract

Keywords

Get full access to this article

References