Part II radiative transfer efficiency of a flat plate TPV system: Analytical model and numerical results

1995 ◽  
Author(s):  
Hoyt C. Hottel
Keyword(s):  
Radiative Transfer ◽  
Flat Plate ◽  
Analytical Model ◽  
Numerical Results ◽  
Transfer Efficiency

Dynamic Compressive Response of Sinusoidal Corrugated Core Sandwich Plates

2018 ◽  
Vol 10 (07) ◽  
pp. 1850075 ◽  
Author(s):  
Jian-Xun Zhang ◽  
Yang Ye ◽  
Qing-Hua Qin ◽  
T. J. Wang
Keyword(s):  
Strain Hardening ◽  
Analytical Model ◽  
Plastic Material ◽  
Deformation Mode ◽  
Numerical Results ◽  
Collapse Mechanism ◽  
Sandwich Plates ◽  
Fe Method ◽  
Compressive Response ◽  
Reaction Forces

In this paper, the dynamic compressive response of metal sinusoidal corrugated core sandwich plates is investigated. The analytical model for the reaction forces of top and bottom face sheets subjected to constant velocity are developed. Finite element (FE) method is carried out to predict the dynamic collapse of metal sinusoidal corrugated cores. Several collapse modes of cores are found in terms of different impact velocity and relative core density. The analytical predications are compared with numerical results, and the analytical model captures numerical results for reaction forces reasonably. The collapse mechanism maps are constructed for sinusoidal corrugated cores with elastic-perfectly plastic material and strain hardening plastic material. The effect of strain rate sensitive on the collapse response is discussed. It is demonstrated that the strain hardening of the metal material increases the dominant deformation mode of the collapse mechanism maps.

scholarly journals Discrete angle radiative transfer: 3. Numerical results and meteorological applications

1990 ◽  
Vol 95 (D8) ◽  
pp. 11729 ◽  
Author(s):  
Anthony Davis ◽  
Philip Gabriel ◽  
Shaun Lovejoy ◽  
Daniel Schertzer ◽  
Geoffrey L. Austin
Keyword(s):  
Radiative Transfer ◽  
Numerical Results

Flow along streamwise corners revisited

2003 ◽  
Vol 476 ◽  
pp. 223-265 ◽  
Author(s):  
A. RIDHA
Keyword(s):  
Boundary Layer ◽  
Flat Plate ◽  
Three Dimensional ◽  
Numerical Results ◽  
Intermediate Layers ◽  
Concave Corner ◽  
Dimensional Boundary ◽  
Streamwise Pressure Gradient ◽  
Corner Flows ◽  
Corner Layer

In this paper we investigate the three-dimensional laminar incompressible steady flow along a corner formed by joining two similar quarter-infinite unswept wedges along a side-edge. We show that a four-region construction of the potential flow arises naturally for this flow problem, the formulation being generally valid for a corner of an arbitrary angle (π−2α), including the limiting cases of semi- and quarter-infinite flat-plate configurations. This construction leads to five distinct three-dimensional boundary-layer regions, whereby both the spanwise length and velocity scales of the blending intermediate layers are O(δ), with Re−1/2 [Lt ] δ [Lt ] 1, Re being a reference Reynolds number supposed to be large. This reveals crucial differences between concave and convex corner flows. For the latter flow regime, the corner-layer motion is shown to be mainly controlled by the secondary flow which effectively reduces to that past sharp wedges with solutions being unique and existing only for favourable streamwise pressure gradients. In this regime, the corner-layer thickness is shown to be O(Re−0.5+α/π/δ2α/π), −½π [les ] α [les ] 0, which is much smaller than O(Re−1/2) for concave corner flows.Crucially, our numerical results show conclusively that, for α ≠ 0, closed streamwise symmetrically disposed vortices are generated inside the intermediate layers, confirming thus the prediction made by Moore (1956) for a rectangular corner, which has so far remained unconfirmed in the literature.For almost planar corners, three-dimensional corner boundary-layer features are shown, as in (Smith 1975), to arise when α ∼ O(1/ln Re). On the other hand, we show that the flow past a quarter-infinite flat plate would be attained when both values of the streamwise pressure gradient and external corner angle (π+2α) become O(1/ln Re) or smaller.Numerical results for all these flow regimes are presented and discussed.

scholarly journals Modeling of Laminar Flows in Rough-Wall Microchannels

2005 ◽  
Vol 128 (4) ◽  
pp. 734-741 ◽  
Author(s):  
R. Bavière ◽  
G. Gamrat ◽  
M. Favre-Marinet ◽  
S. Le Person
Keyword(s):  
Experimental Data ◽  
Reynolds Number ◽  
Numerical Modeling ◽  
Pressure Drop ◽  
Analytical Model ◽  
Analytical Approach ◽  
Laminar Flows ◽  
Numerical Results ◽  
Rough Wall ◽  
Relative Roughness

Numerical modeling and analytical approach were used to compute laminar flows in rough-wall microchannels. Both models considered the same arrangements of rectangular prism rough elements in periodical arrays. The numerical results confirmed that the flow is independent of the Reynolds number in the range 1–200. The analytical model needs only one constant for most geometrical arrangements. It compares well with the numerical results. Moreover, both models are consistent with experimental data. They show that the rough elements drag is mainly responsible for the pressure drop across the channel in the upper part of the relative roughness range.

scholarly journals Analytical model for radiative transfer including the effects of a rough material interface

2016 ◽  
Vol 55 (24) ◽  
pp. 6606
Author(s):  
Thomas E. Giddings ◽  
Anthony R. Kellems
Keyword(s):  
Radiative Transfer ◽  
Analytical Model ◽  
Material Interface

Non-LTE Line Transfer with Diffusion of Excited Atoms II

1978 ◽  
Vol 33 (2) ◽  
pp. 124-129
Author(s):  
D. F. Düchs ◽  
S. Rehker ◽  
J. Oxenius
Keyword(s):  
Radiative Transfer ◽  
Spectral Line ◽  
Numerical Results ◽  
Total Density ◽  
Doppler Broadening ◽  
External Radiation ◽  
Excited Atoms ◽  
Plane Parallel ◽  
Line Transfer

Non-LTE radiative transfer in a spectral line due to two-level atoms is studied taking the diffusion of excited atoms into account. Numerical results are presented for the case of a stationary, plane parallel plasma of constant total density and temperature without external radiation and without exchange of matter with the surroundings, assuming pure Doppler broadening of the spectral line.

Sign in / Sign up

Export Citation Format

Share Document