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Exergy transfer analysis of microwave heating systems

Acevedo, Luis; Usón, Sergio; Uche, Javier - In: Energy 68 (2014) C, pp. 349-363

Exergy transfer analysis is proposed as a complementary method for analyzing and better understanding of the efficiency … interactions wave-thermal system are reviewed. Then, relation between Poynting vector, energy and exergy in microwaves is analyzed … in depth. Afterwards, a 2-D model of energy and exergy transfer for a microwave heating system is presented. The model is …

Persistent link: https://www.econbiz.de/10011053602

Effect of flue gas recirculation during oxy-fuel combustion in a rotary cement kiln

Granados, David A.; Chejne, Farid; Mejía, Juan M.; … - In: Energy 64 (2014) C, pp. 615-625

The effect of Flue Gas Recirculation (FGR) during Oxy-Fuel Combustion in a Rotary Cement Kiln was analyzed by using a CFD model applied to coal combustion process. The CFD model is based on 3D-balance equations for mass, species, energy and momentum. Turbulence and radiation model coupled to a...

Persistent link: https://www.econbiz.de/10011053698

Heat transfer and entropy generation analyses associated with mixed electrokinetically induced and pressure-driven power-law microflows

Shamshiri, Mehdi; Khazaeli, Reza; Ashrafizaadeh, Mahmud; … - In: Energy 42 (2012) 1, pp. 157-169

In the present study, the first and second law analyses associated with combined pressure-driven and electroosmotic flow of power-law liquids through a uniform microannulus are performed numerically. In the first law analysis, the Poisson–Boltzmann and incompressible Navier–Stokes–Fourier...

Persistent link: https://www.econbiz.de/10011054023

Melting over a wavy surface in a rectangular cavity heated from below

Kousksou, T.; Mahdaoui, M.; Ahmed, A.; Msaad, A. Ait - In: Energy 64 (2014) C, pp. 212-219

The current numerical study is conducted to analyze melting in a rectangular closed enclosure by subjecting the bottom wavy surface to a uniform temperature. The cavity vertical walls and the top wall are insulated while the bottom wall is maintained at temperature TB = 38.3 °C. The...

Persistent link: https://www.econbiz.de/10011054386

Thermodynamic analysis of lead–bismuth eutectic turbulent flow in a straight tube

Guo, Jiangfeng; Huai, Xiulan - In: Energy 57 (2013) C, pp. 600-606

The entropy generation in Lead–Bismuth Eutectic (LBE) turbulent flow in a cooled straight tube with a diameter of 10 mm and a length of 1 m is numerically investigated taking into account the temperature-dependent of LBE properties. The standard k-epsilon turbulence model combined with...

Persistent link: https://www.econbiz.de/10011054403

Modelling vSGPs (very shallow geothermal potentials) in selected CSAs (case study areas)

Bertermann, D.; Klug, H.; Morper-Busch, L.; Bialas, C. - In: Energy 71 (2014) C, pp. 226-244

Very shallow geothermal energy resources are amongst the RES (renewable energy sources). They can be expressed as TC (thermal conductivity) (W/m∗K) and VHC (volumetric heat capacity) (MJ/m3∗K) of unconsolidated ground, and can be obtained from a depth of 10 m below the Earth's surface....

Persistent link: https://www.econbiz.de/10011054487

Heat transfer and film cooling effectiveness on the squealer tip of a turbine blade

Park, Jun Su; Lee, Dong Hyun; Rhee, Dong-Ho; Kang, Shin … - In: Energy 72 (2014) C, pp. 331-343

Detailed heat/mass transfer coefficients and film-cooling effectiveness were measured on the tip and inner rim surfaces of a blade with a squealer rim. The test blade was a two-dimensional version of a modern first-stage gas turbine rotor blade with a squealer rim. The experimental apparatus was...

Persistent link: https://www.econbiz.de/10011054719

Numerical investigation of laminar forced convection of water upwards in a narrow annulus at supercritical pressure

Hassan Zaim, E.; Gandjalikhan Nassab, S.A. - In: Energy 35 (2010) 10, pp. 4172-4177

In the present work, convection heat transfer of water at supercritical pressure in a narrow annulus at low Reynolds numbers (less than 1500) has been investigated numerically. The continuity, momentum and energy equations have been solved simultaneously using computational fluid dynamics...

Persistent link: https://www.econbiz.de/10011054764

Analysis and experimental study on thermal dispersion effect of small scale saturated porous aquifer

Liu, Guoqing; Zhou, Zhifang; Li, Zhaofeng; Zhou, Yanzhang - In: Energy 67 (2014) C, pp. 411-421

The coefficient model of small scale thermal mechanical dispersion of saturated porous aquifer is established and it is applied in the heat transfer process of convective dispersion. Step-by-step test is conducted for the two physical processes of one-dimensional unsteady heat conduction of...

Persistent link: https://www.econbiz.de/10011055156

Experimental studies of thermoelectric power generation in dynamic temperature environments

Attia, Peter M.; Lewis, Matthew R.; Bomberger, Cory C.; … - In: Energy 60 (2013) C, pp. 453-456

We show that thermoelectrics can generate power from environments experiencing temporal temperature fluctuations; this source of power is useful for low-power devices in remote locations. We design and characterize devices that employ a thermoelectric module sandwiched between two heat...

Persistent link: https://www.econbiz.de/10011055394