scholarly journals MECHANISM OF PHONATION FOR HUMAN-LIKE ROBOT (RESONANT PART OF RECTANGULAR AIR CHANNEL)

1996 ◽  
Vol 1996 (3) ◽  
pp. 397-402
Author(s):  
Yutaka TANAKA ◽  
Sang Gyu SON ◽  
Hung Gi CHOI
Keyword(s):  
Air Channel ◽  
Resonant Part

An unified approach to inelastic light scattering in Keldysh–Schwinger functional integral formalism

2015 ◽  
Vol 29 (07) ◽  
pp. 1550040 ◽  
Author(s):  
Hyun Cheol Lee
Keyword(s):  
Light Scattering ◽  
Cross Sections ◽  
Golden Rule ◽  
Functional Integral ◽  
Integral Formalism ◽  
Inelastic Light Scattering ◽  
Scattering Geometry ◽  
The One ◽  
Resonant Part ◽  
Functional Integral Formalism

We propose a theoretical framework which can treat the nonresonant and the resonant inelastic light scattering on an equal footing in the form of correlation function, employing Keldysh–Schwinger functional integral formalism. The interference between the nonresonant and the resonant process can be also incorporated in this framework. This approach is applied to the magnetic Raman scattering of two-dimensional antiferromagnetic insulators. The entire set of the scattering cross-sections are obtained at finite temperature, the result for the resonant part agrees with the one obtained by the conventional Fermi golden rule at zero temperature. The interference contribution is shown to be very sensitive to the scattering geometry and the band structure.

Local thermal non-equilibrium conjugate forced convection and entropy generation in an aircraft cabin with air channel partially filled porous insulation

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Oktay Çiçek ◽  
A. Cihat Baytaş
Keyword(s):  
Thermal Conductivity ◽  
Reynolds Number ◽  
Forced Convection ◽  
Cross Section ◽  
Entropy Generation ◽  
Channel Wall ◽  
Darcy Number ◽  
Content Type ◽  
Exit Cross Section ◽  
Air Channel

Purpose The purpose of this study is to numerically investigate heat transfer and entropy generation between airframe and cabin-cargo departments in an aircraft. The conjugate forced convection and entropy generation in a cylindrical cavity within air channel partly filled with porous insulation material as simplified geometry for airframe and cabin-cargo departments are considered under local thermal non-equilibrium condition. Design/methodology/approach The non-dimensional governing equations for fluid and porous media discretized by finite volume method are solved using the SIMPLE algorithm with pressure and velocity correction. Findings The effects of the following parameters on the problem are investigated; Reynolds number, Darcy number, the size of inlet and exit cross-section, thermal conductivity ratio for solid and fluid phases, angle between the vertical symmetry axis and the end of channel wall exit and the gap between adiabatic channel wall and horizontal adiabatic wall separating cabin and cargo sections. Originality/value This paper can provide a basic perspective and framework for thermal design between the fuselage and cabin-cargo sections. The minimum total entropy generation number is calculated for various Reynolds numbers and thermal conductivity ratios. It is observed that the channel wall temperature increases for high Reynolds number, low Darcy number, narrower exit cross-section and wider the gap between channel wall and horizontal.

Speech Compensation for Prosthodontically Created Palatal Asymmetries

1988 ◽  
Vol 31 (1) ◽  
pp. 48-53 ◽  
Author(s):  
Sandra L. Hamlet
Keyword(s):  
General Orientation ◽  
Air Channel

Symmetry of alveolar and palatal contour was altered prosthodontically for five subjects. There was palatographic evidence, for both/s/and/l/, that the prosthodontic changes were not always compensated for in one week of adaptation. Compensation was more pervasive for/s/and took the form of preservation of the general orientation of the air channel in spite of the palatal asymmetries present.

scholarly journals Numerical Investigation of Lift Force Increase in a Hovercraft by Changing the Geometrical Parameters of Flow Transfer Part and Air Channel

2020 ◽  
Vol 15 (30) ◽  
pp. 81-92
Author(s):  
Hossein Sadeghi ◽  
Mehrshad Yassari ◽  
Mohsen Pourfallah ◽  
Mohammad Molla Alipour ◽  
Ahmad Ali Rabienataj Darzi ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Lift Force ◽  
Geometrical Parameters ◽  
Force Increase ◽  
Air Channel ◽  
Flow Transfer

scholarly journals A heat transfer analysis from a porous plate with transpiration cooling

2019 ◽  
Vol 23 (5 Part B) ◽  
pp. 3025-3034 ◽  
Author(s):  
Mustafa Kilic
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Porous Plate ◽  
Particle Diameter ◽  
Heat Transfer Analysis ◽  
Transpiration Cooling ◽  
Cooling Efficiency ◽  
Cooling Effectiveness ◽  
Cooling Effects ◽  
Air Channel

Present study is focused on improving heat transfer from a porous plate by cooling of air with transpiration cooling. Effects of Reynolds number of the air channel flow and particle diameter on cooling effectiveness of porous plate and efficiency of system were investigated experimentally. It was observed that increasing Reynolds number of 15.2% causes a decrease of 6.9% on cooling efficiency of the system and a decrease of 8.6% on cooling effectiveness of porous plate. Decreasing particle diameter causes a significant decrease on surface temperature and an increase on cooling effectiveness of porous plate. Difference of cooling effectiveness of porous plate from dp = 40-200 ?m is 12%. Verification of this study was also shown by comparing experimental results of this study with literature.

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