Results 1 to 10 of about 462,633 (304)

Enhanced heat transfer in parabolic trough using novel perforated plus-shaped turbulator

Case Studies in Thermal Engineering
Enhancing the thermal performance of parabolic trough solar collectors (PTSCs) is critical for developing efficient solar energy systems. Traditional PTSCs use circular absorber tubes, which limit heat transfer due to poor fluid mixing.
Attia Boudjemline, Ali B.M. Ali, S.A.M. Mehryan, A.I. Ismail, Ibrahim Mahariq, Nidhal Ben Khedher   +5 more
doaj   +1 more source

Infrared Thermography applied to measurement of Heat transfer coefficient of water in a pipe heated by Joule effect [PDF]

, 2012
[Departement_IRSTEA]Ecotechnologies [TR1_IRSTEA]SPEEInternational audienceA methodology has been developed based on periodic excitation by Joule effect and infrared thermography measurement.
Bontemps, A., Caron, D., Fournaison, L., Henry, J.F., Leblay, P., Leducq, D.   +5 more
core   +1 more source

Hiding and Confining Charges via "Tube-like" Wormholes

, 2011
We describe two interesting effects in wormhole physics. First, we find that a genuinely charged matter source may appear neutral to an external observer - a phenomenon opposite to the famous Misner-Wheeler "charge without charge" effect. This phenomenon
ALEXANDER KAGANOVICH, Amer N., Bredthauer A., Buchmüller W., Carroll S., EDUARDO GUENDELMAN, Einstein A., EMIL NISSIMOV, Gaete P., Guendelman E., Guendelman E., Israel W., Israel W., Levi-Civita T., Mateos D., Mateos D., Matyjasek J., Misner Ch., Nariai H., Robinson I., SVETLANA PACHEVA, Thorne K., Visser M.   +22 more
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Effect of tube inclination angle on the thermal and fluid dynamic performance of flat tube heat exchanger [PDF]

, 2017
At the present time, the performance of finned and flat tube heat exchangers (HEs) has become a very important issue in the thermal industrial sector. Finned-and-flat tube heat exchangers have gained great interest from many researchers due to their role
Ahmed Yousif Adam, Mohammed
core  

Nanotube Piezoelectricity

, 2003
We combine ab initio, tight-binding methods and analytical theory to study piezoelectric effect of boron nitride nanotubes. We find that piezoelectricity of a heteropolar nanotube depends on its chirality and diameter and can be understood starting from ...
E. J. Mele, E.J. Mele, F. Bernardini, J. Widany, J.P. Lu, N. Troullier, Na Sai, R. Tenne, R.D. King-Smith, S.M. Nakhmanson, V.V. Kochervinskiĭ, X. Gonze   +11 more
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The heat transfer and entropy generation of fin and inclined flat tube heat exchanger

Case Studies in Thermal Engineering
The present work determines the appropriate inclination angles for each flat tube aspect ratio to increase the thermohydraulic performance without extending the heat exchange area.
Luan Nguyen Thanh, Le Minh Nhut, An-Quoc Hoang   +2 more
doaj   +1 more source

An experimental study of near wall flow parameters in the blade end-wall corner region [PDF]

The near wall flow parameters in the blade end-wall corner region is investigated. The blade end-wall corner region was simulated by mounting an airfoil section (NACA 65-015 base profile) symmetric blades on both sides of the flat plate with semi ...
Bhargava, Rakesh K., Raj, Rishi S.
core   +1 more source

Subwavelength total acoustic absorption with degenerate resonators

, 2015
We report the experimental realization of perfect sound absorption by sub-wavelength monopole and dipole resonators that exhibit degenerate resonant frequencies.
Fu, Caixing, Li, Yong, Meng, Chong, Sheng, Ping, Yang, Min, Yang, Zhiyu   +5 more
core   +2 more sources

Numerical analysis of a fin-tube plate heat exchanger with winglets [PDF]

, 2014
In this presented work, numerical analysis of heat transfer and flow characteristic using longitudinal vortex generators (LVGS) in fin and flat tube heat exchanger has been presented. Conjugate heat transfer 3D numerical model has been developed and
Muhsin Al-Juhaishi, Lafta Flayih
core   +1 more source

Comparison of the Energy Performance between Flat-plate and Heat Pipe Evacuated Tube Collectors for Solar Water Heating Systems under Mediterranean Climate Conditions

Journal of Sustainable Development of Energy, Water and Environment Systems, 2019
In this paper, the energy performance of a flat-plate collector and a heat pipe evacuated tube collector exploited for domestic hot water production in the Mediterranean climate is compared.
Altin Maraj, Andonaq Londo, Coskun Firat, Alemayehu Gebremedhin   +3 more
doaj   +1 more source