Entropy generation in two phase model for simulating flow and heat transfer of carbon nanotubes between rotating stretchable disks with cubic autocatalysis chemical reaction

2019 ◽  
Vol 9 (8) ◽  
pp. 1797-1822 ◽  
Author(s):  
Noor Saeed Khan ◽  
Samina Zuhra ◽  
Qayyum Shah
Keyword(s):  
Heat Transfer ◽  
Carbon Nanotubes ◽  
Chemical Reaction ◽  
Entropy Generation ◽  
Phase Model ◽  
Two Phase ◽  
Flow And Heat Transfer ◽  
Cubic Autocatalysis

Effect of thermal radiation on magnetohydrodynamics nanofluid flow and heat transfer by means of two phase model

2015 ◽  
Vol 374 ◽  
pp. 36-43 ◽  
Author(s):  
Mohsen Sheikholeslami ◽  
Davood Domiri Ganji ◽  
M. Younus Javed ◽  
R. Ellahi
Keyword(s):  
Heat Transfer ◽  
Thermal Radiation ◽  
Phase Model ◽  
Nanofluid Flow ◽  
Two Phase ◽  
Flow And Heat Transfer

Scrutiny of Unsteady Flow and Heat Transfer in a Backward-Facing Step Under Pulsating Nanofluid Blowing Using the Eulerian-Eulerian Approach

2017 ◽  
Vol 35 (1) ◽  
pp. 93-105 ◽  
Author(s):  
I. Zahmatkesh ◽  
E. Torshizi
Keyword(s):  
Heat Transfer ◽  
Flow Field ◽  
Unsteady Flow ◽  
Water Flow ◽  
Base Fluid ◽  
Phase Model ◽  
Backward Facing Step ◽  
Two Phase ◽  
Flow And Heat Transfer ◽  
Non Equilibrium

AbstractIn this paper, unsteady flow and heat transfer of water flow in a backward-facing step under pulsating nanofluid blowing are studied numerically. Attention is focused to examine the impact of this type of blowing and its pertinent parameters on the heat transfer performance and to detect possible non-equilibrium between the base fluid and the nanoparticles inside the flow field. To this aim, the Eulerian-Eulerian two-phase model is adopted. This approach consists of separate equation sets for the base fluid and the nanoparticles. So, it provides details of the flow field for each of the constituents, separately. Computations are undertaken for different cases and the consequences of the frequency, amplitude, and the mean velocity of the pulsating blowing as well as the type, diameter, and the volume fraction of the nanoparticles therein on the heat transfer characteristics are analyzed. It is found that in addition to thermal conductivity of the blown nanoparticles, their penetration into the water flow is an important trait that has a momentous role on the heat transfer rate. In the current Eulerian-Eulerian simulation, temperature distributions of the base fluid and the nanoparticles are similar but the corresponding velocity fields are quite distinct. This reveals a kind of non-equilibrium between the base fluid and the nanoparticles inside the flow that invalidates equilibrium approaches (e.g., the single-phase model or the two-phase mixture model) for the description of the problem.

Numerical modeling of the influence of bubbles on flow and heat transfer in the descending gas-liquid flow in a pipe

2012 ◽  
Vol 9 (1) ◽  
pp. 131-135
Author(s):  
M.A. Pakhomov
Keyword(s):  
Heat Transfer ◽  
Gas Phase ◽  
Liquid Flow ◽  
Bubble Diameter ◽  
Gas Content ◽  
Two Phase ◽  
Eulerian Description ◽  
Flow And Heat Transfer ◽  
Gas Liquid Flow ◽  
The Mathematical Model

The paper presents the results of modeling the dynamics of flow, friction and heat transfer in a descending gas-liquid flow in the pipe. The mathematical model is based on the use of the Eulerian description for both phases. The effect of a change in the degree of dispersion of the gas phase at the input, flow rate, initial liquid temperature and its friction and heat transfer rate in a two-phase flow. Addition of the gas phase causes an increase in heat transfer and friction on the wall, and these effects become more noticeable with increasing gas content and bubble diameter.

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