Results 251 to 260 of about 735,606 (326)

Determination of LEDs degradation with entropy generation rate

Journal of Applied Physics, 2017
We propose a method to assess the degradation and aging of light emitting diodes (LEDs) based on irreversible entropy generation rate. We degraded several LEDs and monitored their entropy generation rate (Ṡ) in accelerated tests. We compared the thermoelectrical results with the optical light emission evolution during degradation.
Angel Cuadras   +2 more
openaire   +2 more sources

On the Assessment of Mechanical Degradation of Grease Using Entropy Generation Rate

open access: yesTribology Letters, 2019
A methodology for continuous monitoring of grease degradation subjected to mechanical shearing is proposed. It is hypothesized that the mechanical degradation of grease is akin to the running-in process in a tribo-pair with both transient and steady-state regimes.
K. P. Lijesh, M. M. Khonsari
openaire   +2 more sources

The entropy generation rate minimization for a proposed air ejector for the carpet industry

Meccanica, 2017
In this study, a numerical model is developed to simulate an air ejector pump that is proposed for the carpet industry. Simulations have been performed by solving the compressible, steady-state, two-dimensional Reynolds-averaged Navier–Stokes equations, and k–e Realizable model is used to simulate a turbulent flow.
Esmail Lakzian   +2 more
openaire   +2 more sources

Constructal entropy generation rate minimization for X-shaped vascular networks

International Journal of Thermal Sciences, 2015
Based on constructal theory, an X-shaped vascular network model in a rectangular area is built in this paper. Subjected to the constraints of the total volume of the tubes and space occupied by the rectangular area, the model is optimized by taking the minimizations of the dimensionless entropy generation rate and dimensionless entropy generation ratio,
Huijun Feng   +3 more
openaire   +2 more sources

Heat transfer analysis on MHD flow over a stretchable Riga wall considering Entropy generation rate: A numerical study

Numerical Methods for Partial Differential Equations, 2020
Current paper explores the MHD two‐dimensional stagnation point flow over a stretchable Riga wall in the presence of porous medium. Cattaneo‐Christove heat and mass flux model is used to examine the heat and mass transfer analysis. Particular interest is
F. Shah   +3 more
semanticscholar   +1 more source

Home - About - Disclaimer - Privacy