Results 31 to 40 of about 3,296 (231)

Estimating turbulent energy flux vertical profiles from uncrewed aircraft system measurements: exemplary results for the MOSAiC campaign [PDF]

Atmospheric Measurement Techniques, 2023
This study analyzes turbulent energy fluxes in the Arctic atmospheric boundary layer (ABL) using measurements with a small uncrewed aircraft system (sUAS).
U. Egerer, U. Egerer, U. Egerer, J. J. Cassano, J. J. Cassano, J. J. Cassano, M. D. Shupe, M. D. Shupe, G. de Boer, G. de Boer, D. Lawrence, A. Doddi, H. Siebert, G. Jozef, G. Jozef, G. Jozef, R. Calmer, R. Calmer, J. Hamilton, J. Hamilton, C. Pilz, M. Lonardi   +21 more
doaj   +1 more source

Rayleigh and Prandtl number scaling in the bulk of Rayleigh–Bénard turbulence [PDF]

Physics of Fluids, 2005
The Ra and Pr number scaling of the Nusselt number Nu, the Reynolds number Re, the temperature fluctuations, and the kinetic and thermal dissipation rates is studied for (numerical) homogeneous Rayleigh–Bénard turbulence, i.e., Rayleigh–Bénard turbulence with periodic boundary conditions in all directions and a volume forcing of the temperature field ...
Calzavarini E., Lohse D., Toschi F., Tripiccione R.   +3 more
openaire   +5 more sources

Impact of Prandtl numbers on turbulence modeling

Journal of Physics: Conference Series, 2019
Abstract A low-Reynolds number (LRN) k - ε ˜
Md Mizanur Rahman, Ming LV, Zefei Zhu
openaire   +1 more source

Temperature statistics in turbulent Rayleigh–Bénard convection with a Prandtl number of Pr = 12.3

AIP Advances, 2022
The transport of plumes in turbulent convective systems must be understood to study the mantle and various industrial applications. We measured the probability density function P(T) of the temperature at various radial and vertical positions in the bulk ...
Ping Wei, Xinyu Chen, Chensen Lin
doaj   +1 more source

Theoretical Investigation on the Fully Developed Turbulent Heat Transfer Characteristics of Liquid Sodium

Frontiers in Energy Research, 2020
Liquid sodium has been used as the working medium for the high-temperature heat pipe and the generation IV sodium cooled fast reactor due to its extremely high conductivity.
Rui Zhang, Zhenying Wang, Zhenhong Wang, Tingting Ren, Jiangwu Shi   +4 more
doaj   +1 more source

Thermal-hydraulic research on rod bundle in the LBE fast reactor with grid spacer

Nuclear Engineering and Technology, 2022
s: The research on the flow and heat transfer characteristics of lead bismuth(LBE) is significant for the thermal-hydraulic calculation, safety analysis and practical application of lead-based fast reactors(LFR).
Jie Liu, Ping Song, Dalin Zhang, Shibao Wang, Chao Lin, Yapeng Liu, Lei Zhou, Chenglong Wang, Wenxi Tian, Suizheng Qiu, G.H. Su   +10 more
doaj   +1 more source

ON THE TURBULENT PRANDTL NUMBER IN STABLY STRATIFIED TURBULENCE BY SECOND ORDER MODELS

Journal of Thermal Engineering, 2020
The aim of this work is to investigate the behavior of the Turbulent Prandtl number by second order modeling of a stably stratified homogeneous sheared turbulence. By analytic solutions, we have confirmed the asymptotic equilibrium behavior of the turbulent Prandtl number. Then two between the most second order models of turbulence; the Classic Launder-
Saida NAİFER, M. BOUZAİANE
openaire   +3 more sources

Anisotropic turbulent viscosity and large-scale motive force in thermally driven turbulence at low Prandtl number

Archives of Mechanics, 2022
The fully developed turbulent Boussinesq convection is known to form large-scale rolls, often termed the ‘large-scale circulation’ (LSC). It is an interesting question how such a large-scale flow is created, in particular in systems when the energy input
K.A. Mizerski
doaj   +1 more source

Development of New Turbulent Prandtl Number Models for Low- and Medium-Prandtl-Number Fluids via Multi-Gene Gene Expression Programming

Applied Sciences
The study of turbulent Prandtl number is important for turbulent flows with heat transfer. Despite its importance, no universal model exists that is able to capture its behavior for a range of molecular Prandtl numbers.
Burak Pehlivan, Özgür Ekici
doaj   +1 more source

Turbulent passive scalar field of a small prandtl number

, 1986
The statistical-mechanics theory of the passive scalar field convected by turbulence, developed in an earlier paper [Phys. Fluids 28, 1299 (1985)], is extended to the case of a small molecular Prandtl number.
Qian J, QIAN, J (reprint author), BEIJING INST ENVIRONM FEATURES,POB 142,BRANCH BOX 207,BEIJING,PEOPLES R CHINA.   +1 more
core   +1 more source