Results 41 to 50 of about 3,296 (231)

Multiscale Modeling and Computation of 3D Incompressible Turbulent Flows [PDF]

, 2012
In the first part, we present a mathematical derivation of a closure relating the Reynolds stress to the mean strain rate for incompressible turbulent flows.
Hu, Xin
core   +1 more source

Study on the turbulent Prandtl number model for liquid metal flow and heat transfer in a narrow rectangular channel

Frontiers in Energy Research
In order to improve the core power density of liquid metal reactors, plate-type fuel assemblies are typically used, which have obvious advantages in heat transfer capacity.
Zhang Xue, Yu Hongxing, Deng Jian, Du Sijia, Wang Xiaoyu, Feng Wenpei   +5 more
doaj   +1 more source

Numerical Heat Transfer Study of Liquid Metal in Triangular Rod Bundle Based on k-ε-kθ-εθ Model

Yuanzineng kexue jishu, 2022
Compared with the constant turbulent Prandtl number (Prt) model, a four-equation model considers the difference between the velocity and temperature boundary layer of liquid metals by introducing the turbulence time-scale, which is expected to improve ...
SU Xingkang;GU Long;LI Xianwen;ZHANG Lu;SHENG Xin
doaj  

Lagrangian Modeling of Turbulent Dispersion from Instantaneous Point Sources at the Center of a Turbulent Flow Channel

Fluids, 2017
The paper is focused on the simulation and modeling of the dispersion from an instantaneous source of heat or mass located at the center of a turbulent flow channel.
Quoc Nguyen, Samuel E. Feher, Dimitrios V. Papavassiliou   +2 more
doaj   +1 more source

A model for universal spatial variations of temperature fluctuations in turbulent Rayleigh-Bénard convection

Theoretical and Applied Mechanics Letters, 2021
We propose a theoretical model for spatial variations of the temperature variance σ2(z,r) (z is the distance from the sample bottom and r the radial coordinate) in turbulent Rayleigh-Bénard convection (RBC).
Xiaozhou He, Eberhard Bodenschatz, Guenter Ahlers   +2 more
doaj   +1 more source

Two-dimensional magnetohydrodynamic turbulence in the small magnetic Prandtl number limit

, 2012
In this paper we introduce a new method for computations of two-dimensional magnetohydrodynamic (MHD) turbulence at low magnetic Prandtl number $\Pra=\nu/\eta$.
Tobias, Steve, Dritschel, David Gerard
core   +1 more source

Impact of Cattaneo–Christov Heat and Mass Flux on MHD Hybrid Nanofluid Flow Over an Extending Surface With Convective and Mass Flux Effects

Asia-Pacific Journal of Chemical Engineering, EarlyView.
ABSTRACT This study investigates the flow of a magnetized hybrid nanofluid over a permeable stretching surface. The mass and thermal transport within the system is regulated using the Cattaneo–Christov flux theory. The fluid is additionally subjected to thermophoresis, chemical reaction, Brownian motion, and activation energy effects.
Ebrahem A. Algehyne, Abdul Bariq, Mounirah Areshi, Fahad Maqbul Alamrani, Zehba Raizah, Izharul Haq, Anwar Saeed   +6 more
wiley   +1 more source

Prandtl-Blasius temperature and velocity boundary-layer profiles in turbulent Rayleigh-Bénard convection [PDF]

, 2010
The shapes of the velocity and temperature profiles near the horizontal conducting plates' centre regions in turbulent Rayleigh–Bénard convection are studied numerically and experimentally over the Rayleigh number range 108 ≲ Ra ≲ 3 × 1011 and the ...
Zhou, Quan, Stevens, Richard Johannes Antonius Maria, DETLEF LOHSE, QUAN ZHOU, Sugiyama, K., SIEGFRIED GROSSMANN, Stevens, Richard Johannes Antonius Maria; id_orcid, Lohse, Detlef, RICHARD J. A. M. STEVENS, KAZUYASU SUGIYAMA, Grossmann, Siegfried, Xia, K., KE-QING XIA   +12 more
core   +1 more source

Global and Detailed Calculation of Tube Wall Temperature in a Process Furnace Steam Superheater

Chemie Ingenieur Technik, EarlyView.
This study presents a comparison between an iterative global model and multiple approaches to a new non‐iterative model with the purpose of predicting tube wall temperature of a superheater. The results show that the non‐iterative method achieves sufficient accuracy while improving the prediction of local temperature distribution and better ...
Anežka Michálková, Zdeněk Jegla
wiley   +1 more source

Transient thermal modelling of green anode cooling in the aluminium industry

The Canadian Journal of Chemical Engineering, EarlyView.
Summary of the methodology. Abstract Anodes, which are used in electrolytic aluminium production, are made by mixing dry aggregate (petroleum coke, rejected anodes, and butts) with coal tar pitch, compacting the resulting paste (green anode), and baking (baked anode). After compaction, the anodes are cooled to maintain their structural integrity before
Mohammadhossein Dabaghi, Duygu Kocaefe, Yasar Kocaefe   +2 more
wiley   +1 more source