## THERMAL SCIENCE

International Scientific Journal

### ANALYSIS OF HEAT TRANSFER IN A HEATED TUBE WITH A DIFFERENT TYPED DISC INSERTION

**ABSTRACT**

Heat transfer and fluid flow can be controlled in a tube by inserting different typed passive elements. The main objective of this study is to control heat transfer and fluid flow using cutting edged disc in pipe. Governing equations of laminar, two-dimensional flow is solved via finite volume technique. The disc is adiabatic and its thickness is 5mm. It is located into axial axis of the tube. Three cases were applied based on the type of the disc as inclination angle of the top side is 45º and 0º. Calculations were performed for different Reynolds number in the range of 335 < Re < 845. Three cases were tested based on types of discs. It is observed that each position exhibits different heat transfer ratio according to studied Reynolds number. The highest heat transfer is formed when inlet flow impinges to flat side of the cutting edged baffle.

**KEYWORDS**

PAPER SUBMITTED: 2011-08-09

PAPER REVISED: 2011-09-14

PAPER ACCEPTED: 2011-10-08

**THERMAL SCIENCE** YEAR

**2012**, VOLUME

**16**, ISSUE

**Issue 1**, PAGES [139 - 149]

- Webb, R.L., Kakac, S., Shah, R.K., Aung, W., (Eds.), Handbook of Single-Phase Convective Heat Transfer, Wiley-Interscience, New York, (Chapter 17) (1987).
- Bergles, A.E., Principles of Heat Transfer Augmentation, Heat Exchangers, Thermal-Hydraulic Fundamentals and Design, Hemisphere, New York, (1981) pp. 819-842.
- Bergles, A.E., Heat exchanger, in: G.F. Hewitt (Ed.), Heat Exchanger Design Handbook—Part 1, Begell House, New York, (Chapter 2) (1998).
- Webb, R.L., Kim, N.H., Principles of Enhanced Heat Transfer, second ed., Taylor & Francis, New York, (2005).
- Webb, R.L., Performance Evaluation Criteria For Use of Enhanced Heat Transfer Surfaces in Heat Exchanger Design, Int. J. Heat Mass Transfer, 24 (1981) pp. 715- 726.
- Gunes, S., Ozceyhan, V., Buyukalaca, O., Heat Transfer Enhancement In A Tube With Equilateral Triangle Cross Sectioned Coiled Wire Inserts, Exp. Thermal Fluid Sci., 34 (2010) pp. 684-691.
- Eiamsa-ard, S., Wongcharee, K., Eiamsa-ard, P., Thianpong, C., Heat Transfer Enhancement in a Tube Using Delta-Winglet Twisted Tape Inserts, Appl. Thermal Eng., 30 (2010) pp. 310-318.
- Fu, W.S., Ching, C.T., Enhancement of Heat Transfer for A Tube With an Inner Tube Insertion, Int. J. Heat Mass Transfer, 37 (1994) pp. 499-509.
- Fu, W.S., Ching, C.T., Huang, C.S., Experimental Study of The Heat Transfer Enhancement of an Outer Tube With an Inner-Tube Insertion, Int. J. Heat Mass Transfer, 38 (1995) pp. 3443-3454.
- Oztop, H.F., Dağtekin, I., Enhancement of Heat Transfer in a Pipe with Inner Contraction-Expansion-Contraction Pipe Insertion, Int. Comm. Heat Mass Transfer, 30 (2003) pp. 1157-1168.
- Varol, Y., Flow and Heat Transfer in Finned Tubes, PhD Dissertation, Cukurova University, Turkey, (In Turkish), (1996).
- Nguyen, T.M., Khodadadi, J.M., Vlachos, N.S., Laminar Flow and Conjugate Heat Transfer in Rib Roughened Tubes, Numerical Heat Transfer, 15 (1989) pp. 165-179.
- Fu, W.S., Tong, B.H., Effects of Eccentricity of Cylinder and Blockage Ratio on Heat Transfer by an Oscillating Cylinder in A Channel Flow, Int. Comm. Heat Mass Transfer, 30 (2003) pp. 401-412.
- Promvonge, P., Chompookham, T., Kwankaomeng, S., Ve Thianpong, C., Enhanced heat transfer in triangular ribbed channel with longitudinal vortex generator, Energy Conversion Management, 51 (2010) pp. 1242-1249.
- Yu, B.J. J.H. Nie, Q.W. Wang and W.Q. Tao, Experimental Study on The Pressure Drop and Heat Transfer Characteristics of Tubes with Internal Wave-Like Longitudinal Fins, Heat Mass Transfer, 35 (1999) pp. 65-73.
- Turan, B., Mixed convection heat transfer in a pipe with sharp-edged object inserted, MsC thesis, Fırat University, 2010 (In Turkish)
- Patankar, S.V., Numerical Heat transfer and fluid flow, Hemisphere, Newyork, (1980).
- Fluent 6. User's Guide, Fluent.
- Gambit 2, User's Guide, Fluent
- Mohammed, H.A., Salman, Y.K., Numerical Study of Combined Convection Heat Transfer For Thermally Developing Upward Flow In a Vertical Cylinder, Therm. Sci., 12 (2008) pp. 89-102.