Abstract
In this study, the separated flow over flat and blocked surfaces was investigated experimentally. Velocity and turbulence intensity measurements were carried out by a constanttemperature hot wire anemometer and static pressure measurements by a micro-manometer. The flow separations and reattachments were occurred before the first block, on the first block, between blocks and after the last block, and the presence of the blocks significantly increased the turbulent intensity
References
- Armaly, B.F., Li, A. ve Nie, J.H. (2001). Three-dimensional forced convection flow adjacent to backward-facing step. Journal of Thermophysics and Heat Transfer, 16, 222- 227.
- Atlı, V. (1988). Subsonic flow over a two dimensional obstacle immersed in a turbulent boundary layer on a flat surface, J. Wind Eng. Ind. Aerodyn., 31, 225-239.
- Buchlin, J.M. (2002). Convective heat transfer in a channel with perforated ribs, Int. J. Therm. Sci., 41, 332-340.
- Chen, Y.M. ve Wang, K.C. (1996). Simulation and measurement of turbulent heat transfer in a channel with a surface-mounted rectangular heated block, Heat and Mass Transfer, 31, 463-473.
- Davalath, J. ve Bayazıtoglu, Y. (1987). Forced convection cooling across rectangular blocks, Journal of Heat Transfer, 109, 321-328.
- Faghri, M., Molki, M. ve Chrupcala (1994). J. Entrance analysis of turbulent flow in an array of heated rectangular blocks, Intersoc. Conf. Thermal Phenom., Washington DC, USA., 18, 198-206.
- Furukawa, T. ve Yang, W. (2003). Thermal-fluid flow in parallel boards with heat generating blocks, International Journal of Heat and Mass Transfer, 46, 5005–5015.
- Igarashi, T. ve Takasaki, H. (1992). Fluid flow around three rectangular blocks in a flat- plate laminar boundary layer, Experimental Heat Transfer, 5, 17-31.
- Kim, S.H. ve Anand, N.K. (1994). Turbulent heat transfer between a series of parallel plates with surface-mounted discrete heat sources, Journal of Heat Transfer, 116, 577-587.
- Kline, S.J. ve McClintock, F.A. (1953). Describing uncertainties in single sample experiments, Mech. Eng., 75, 3-8.
- Korichi, A. ve Oufer, L. (2006). Heat transfer enhancement in oscillatory flow in channel with periodically upper and lower walls mounted obstacles, International Journal of Heat and Fluid Flow, 52, 1138-1148.
- Ryu, D.N., Choi, D.H. ve Patel, V.C. (2007). Analysis of turbulent flow in channels roughened by two-dimensional ribs and three-dimensional blocks. Part I: Resistance, International Journal of Heat and Fluid Flow, 28, 1098-1111.
- Terekhov, V.I., Yarygina, N.I. ve Zhdanov, R.F. (2003). Heat transfer in turbulent separated flows in the presence of high free-stream turbulence, International Journal of Heat and Mass Transfer, 46, 4535–4551.
- Tropea, C.D. ve Gackstatter, R. (1985). The flow over two-dimensional surface-mounted obstacles at low Reynolds numbers, Journal of Fluids Engineering, 107, 489-494.
- Wahidi, R., Chakrouni, W. ve Al-Fahed, S. (2005). The behavior of the skin-friction coefficient of a turbulent boundary layer flow over a flat plate with differently configured transverse square grooves, Experimental Thermal and Fluid Science, 30, 141-152.
- Young, T.J. ve Vafai, K. (1998). Convective flow and heat transfer in a channel containing multiple heated obstacles, International Journal of Heat and Mass Transfer, 41, 3279- 3298.
- Makale 11.07.2012 tarihinde alınmış, 02.11.2012 tarihinde düzeltilmiş, 09.11.2012 tarihinde kabul edilmiştir.
Abstract
Bu çalışmada; düz ve bloklu yüzeyler üzerinde ayrılmış akış deneysel olarak incelenmiştir. Hız ve türbülans yoğunlukları ölçümleri sabit sıcaklıklı bir kızgın tel anemometresi ile yapılırken statik basınç ölçümleri bir mikro manometre ile yapılmıştır. İlk bloktan önceki yüzeyde, ilk bloğun üstünde, bloklar arasında ve son bloğun arkasındaki yüzeyde ayrılma ve yeniden birleşmeler oluşmuş ve blokların varlığı türbülans yoğunluğunu önemli derecede arttırmıştır
Keywords
References
- Armaly, B.F., Li, A. ve Nie, J.H. (2001). Three-dimensional forced convection flow adjacent to backward-facing step. Journal of Thermophysics and Heat Transfer, 16, 222- 227.
- Atlı, V. (1988). Subsonic flow over a two dimensional obstacle immersed in a turbulent boundary layer on a flat surface, J. Wind Eng. Ind. Aerodyn., 31, 225-239.
- Buchlin, J.M. (2002). Convective heat transfer in a channel with perforated ribs, Int. J. Therm. Sci., 41, 332-340.
- Chen, Y.M. ve Wang, K.C. (1996). Simulation and measurement of turbulent heat transfer in a channel with a surface-mounted rectangular heated block, Heat and Mass Transfer, 31, 463-473.
- Davalath, J. ve Bayazıtoglu, Y. (1987). Forced convection cooling across rectangular blocks, Journal of Heat Transfer, 109, 321-328.
- Faghri, M., Molki, M. ve Chrupcala (1994). J. Entrance analysis of turbulent flow in an array of heated rectangular blocks, Intersoc. Conf. Thermal Phenom., Washington DC, USA., 18, 198-206.
- Furukawa, T. ve Yang, W. (2003). Thermal-fluid flow in parallel boards with heat generating blocks, International Journal of Heat and Mass Transfer, 46, 5005–5015.
- Igarashi, T. ve Takasaki, H. (1992). Fluid flow around three rectangular blocks in a flat- plate laminar boundary layer, Experimental Heat Transfer, 5, 17-31.
- Kim, S.H. ve Anand, N.K. (1994). Turbulent heat transfer between a series of parallel plates with surface-mounted discrete heat sources, Journal of Heat Transfer, 116, 577-587.
- Kline, S.J. ve McClintock, F.A. (1953). Describing uncertainties in single sample experiments, Mech. Eng., 75, 3-8.
- Korichi, A. ve Oufer, L. (2006). Heat transfer enhancement in oscillatory flow in channel with periodically upper and lower walls mounted obstacles, International Journal of Heat and Fluid Flow, 52, 1138-1148.
- Ryu, D.N., Choi, D.H. ve Patel, V.C. (2007). Analysis of turbulent flow in channels roughened by two-dimensional ribs and three-dimensional blocks. Part I: Resistance, International Journal of Heat and Fluid Flow, 28, 1098-1111.
- Terekhov, V.I., Yarygina, N.I. ve Zhdanov, R.F. (2003). Heat transfer in turbulent separated flows in the presence of high free-stream turbulence, International Journal of Heat and Mass Transfer, 46, 4535–4551.
- Tropea, C.D. ve Gackstatter, R. (1985). The flow over two-dimensional surface-mounted obstacles at low Reynolds numbers, Journal of Fluids Engineering, 107, 489-494.
- Wahidi, R., Chakrouni, W. ve Al-Fahed, S. (2005). The behavior of the skin-friction coefficient of a turbulent boundary layer flow over a flat plate with differently configured transverse square grooves, Experimental Thermal and Fluid Science, 30, 141-152.
- Young, T.J. ve Vafai, K. (1998). Convective flow and heat transfer in a channel containing multiple heated obstacles, International Journal of Heat and Mass Transfer, 41, 3279- 3298.
- Makale 11.07.2012 tarihinde alınmış, 02.11.2012 tarihinde düzeltilmiş, 09.11.2012 tarihinde kabul edilmiştir.
Details
| Primary Language | Turkish |
|---|---|
| Journal Section | Research Articles |
| Authors | |
| Publication Date | April 1, 2013 |
| Submission Date | December 19, 2014 |
| Published in Issue | Year 2013 Volume: 18 Issue: 1 |
Cite
Announcements:
30.03.2021-Beginning with our April 2021 (26/1) issue, in accordance with the new criteria of TR-Dizin, the Declaration of Conflict of Interest and the Declaration of Author Contribution forms fulfilled and signed by all authors are required as well as the Copyright form during the initial submission of the manuscript. Furthermore two new sections, i.e. ‘Conflict of Interest’ and ‘Author Contribution’, should be added to the manuscript. Links of those forms that should be submitted with the initial manuscript can be found in our 'Author Guidelines' and 'Submission Procedure' pages. The manuscript template is also updated. For articles reviewed and accepted for publication in our 2021 and ongoing issues and for articles currently under review process, those forms should also be fulfilled, signed and uploaded to the system by authors.