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RISThe effects of rate of expansion and injection of water droplets on the entropy generation of nucleating steam flow in a Laval nozzle
The entropy generation due to irreversible heat
transfer between vapor and liquid phases in a nucleating
steam flow in a Laval nozzle is studied. To calculate the
entropy generation due to self-condensation in transonic...
New methods for calculating the inlet hydrodynamic and thermal length in a laminar nanofluid flow by applying entropy generation theory
are according to difference of mean temperature and walls temperature,
dimensionless temperature and Nusselt number. The new method to predict the lth is due to thermal
entropy generation. When the entropy generation approaches to 0.94% of final...
Performance analysis of a minichannel-based solar collector using different nanofluids
by Cu/water nanofluids, and after that TiO2/water, Al2O3/water, and SiO2/water nanofluids are in ranks of second to fourth. The results of second law analysis elucidate that Cu/water nanofluid produces the lowest entropy generation among the nanofluids...
Costs Due to Entropy Generation in a Vertical Annulus Using Nanofluids and Different Thermophysical Models
sets of models are used to calculate the viscosity and thermal conductivity of nanofluid. The main aim of this work is to estimate the operational costs ($) due to entropy generation using nanofluids in the annulus. The results show that using...
Entropy analysis of a solar-driven variable geometry ejector using computational fluid dynamics
to ejector performance drop. Since the entropy generation is equivalent to performance losses, this parameter was investigated in numerical simulations. The results showed that the mixing phenomenon act as a main role in the entropy generation when...
Effects of rib shapes on entropy generation of turbulent flow in duct
Ducts are often used in reactors and heat exchangers. Using rough surfaces in ducts is recognized as an effective technique to enhance heat transfer. In this research, an entropy generation analysis is carried out for turbulent flow inside a ribbed...
Second law analysis of a nanofluid-based solar collector using experimental data
The present study deals with the entropy generation analysis of a flat-plate solar collector using SiO2/
ethylene glycol–water nanofluids. For this purpose, available experimental data on the performance of a flat-plate solar collector...
Compressibility and rarefaction effects on entropy and entropy generation in micro/nano Couette flow using DSMC
and rarefaction on entropy and entropy generation in terms of viscous dissipation and thermal diffusion are studied in a wide range of Mach and Knudsen numbers and the observed physics are discussed. In this regard, we computed entropy by using its kinetic theory...
Exergetic Performance of a Cylindrical Methane-Air Microcombustor under Various Inlet Conditions
The entropy generation analysis is performed on a methane-air cylindrical microcombustor. The combustor is studied under different fuel-air equivalence ratios and two different inlet velocities. The results reveal that entropy generation due to heat...
Entropy Generation Analysis for Microscale Forced Convection in Thermal Entrance Region
An analytical study on entropy generation considering viscous dissipation effect in the circular microchannel
is reported. The fluid flow is steady, laminar, hydrodynamically fully developed and thermally
developing. In the first law...