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Başlık: An experimental investigation of flow and heat transfer characteristics over blocked surfaces in laminar and turbulent flows
Yazarlar: Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Mühendisliği Bölümü.
Yemenici, Onur
Fıratoğlu, Zeynel Abidin
Umur, Habib
AAF-6642-2021
36676656200
7801693157
6602945164
Anahtar kelimeler: Thermodynamics
Engineering
Mechanics
Blocked surface
Separation
Convective heat transfer
3-dimensional blocks
2-dimensional ribs
Convective flow
Parallel plates
Fluid-flow
Channel
Enhancement
Simulation
Obstacle
Series
Flow separation
Heat transfer coefficients
Thermocouples
Constant-temperature anemometers
Convective heat transfer
Different sizes
Experimental investigations
Flat surfaces
Flow and heat transfer
Free-stream velocity
Heat Transfer enhancement
Laminar and turbulent flow
Low-speed wind tunnel
Mean velocities
Reattachment
Rectangular block
Stanton numbers
Static pressure
Surface area
Turbulence intensity
Turbulence level
Wall temperatures
Turbulent flow
Yayın Tarihi: Haz-2012
Yayıncı: Pergamon-Elsevier Science
Atıf: Yemenici, O. vd. (2012). "An experimental investigation of flow and heat transfer characteristics over blocked surfaces in laminar and turbulent flows". International Journal of Heat and Mass Transfer, 55(13-14), 3641-3649.
Özet: Flow and heat transfer measurements were obtained over a blocked surface mounted on a low speed wind tunnel in order to investigate the combined the effects of free stream velocities and the different size of rectangular blocks on the flow and heat transfer characteristics. Mean velocity and turbulence intensities were measured by a constant temperature anemometer and wall temperatures by copper-constant thermocouple and static pressures by a micro-manometer, respectively. It was found that the flow separations and reattachments were occurred before the first blocks, on the first blocks, between blocks and after the last blocks. The blocked surface area and flow separation caused not only heat transfer enhancement but higher turbulence levels as well. The average Stanton numbers, for block heights of 10, 15 and 20 mm, were higher than those of flat surface by 82%, 95%, 113% in laminar and 27%, 38%, 50% in turbulent, respectively. These results showed that heat transfer enhancement on the blocked surface increased with block heights and become more pronounced in laminar than that of turbulent flows.
URI: https://doi.org/10.1016/j.ijheatmasstransfer.2012.02.064
https://www.sciencedirect.com/science/article/pii/S0017931012001275?via%3Dihub#!
http://hdl.handle.net/11452/25686
ISSN: 0017-9310
1879-2189
Koleksiyonlarda Görünür:Scopus
Web of Science

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