Back to Search
Start Over
Three-dimensional unsteady natural convection and entropy generation in an inclined cubical trapezoidal cavity with an isothermal bottom wall
- Source :
- Scipedia Open Access, Scipedia SL
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- Numerical computation of unsteady laminar three-dimensional natural convection and entropy generation in an inclined cubical trapezoidal air-filled cavity is performed for the first time in this work. The vertical right and left sidewalls of the cavity are maintained at constant cold temperatures. The lower wall is subjected to a constant hot temperature, while the upper one is considered insulated. Computations are performed for Rayleigh numbers varied as 103 ⩽ Ra ⩽ 105, while the trapezoidal cavity inclination angle is varied as 0° ⩽ Φ ⩽ 180°. Prandtl number is considered constant at Pr = 0.71. Second law of thermodynamics is applied to obtain thermodynamic losses inside the cavity due to both heat transfer and fluid friction irreversibilities. The variation of local and average Nusselt numbers is presented and discussed, while, streamlines, isotherms and entropy contours are presented in both two and three-dimensional pattern. The results show that when the Rayleigh number increases, the flow patterns are changed especially in three-dimensional results and the flow circulation increases. Also, the inclination angle effect on the total entropy generation becomes insignificant when the Rayleigh number is low. Moreover, when the Rayleigh number increases the average Nusselt number increases.
- Subjects :
- Engineering, Chemical
Engineering, Civil
Trapezoidal cavity
020209 energy
Prandtl number
Transient natural convection
Thermodynamics
02 engineering and technology
Entropy generation
Physics, Applied
Physics::Fluid Dynamics
symbols.namesake
0203 mechanical engineering
Three-dimensional flow
Architecture
0202 electrical engineering, electronic engineering, information engineering
Materials Science, Textiles
Streamlines, streaklines, and pathlines
Rayleigh scattering
Engineering(all)
Second law analysis
Mathematics
Natural convection
Engineering, Environmental
General Engineering
Engineering, Electrical & Electronic
Laminar flow
Rayleigh number
Mechanics
Nusselt number
Engineering, Marine
Engineering, Mechanical
Physics, Nuclear
020303 mechanical engineering & transports
Heat transfer
symbols
Computer Science, Interdisciplinary Applications
Subjects
Details
- ISSN :
- 11100168
- Volume :
- 55
- Database :
- OpenAIRE
- Journal :
- Alexandria Engineering Journal
- Accession number :
- edsair.doi.dedup.....208408589f08b25db491765c6414752b