Results 231 to 240 of about 9,408,233 (288)

Estimation of Nusselt number and effectiveness of double‐pipe heat exchanger with Al2O3–, CuO–, TiO2–, and ZnO–water based nanofluids

Heat Transfer, 2020
This paper deals with experimental studies carried out to analyze heat transfer characteristics of Al2O3–, CuO–, TiO2–, and ZnO–water based nanofluids in a double‐pipe, counter flow heat exchanger for different volume concentrations (0.025%, 0.05%, 0.075%
Bikash Pattanayak, Abhishek Mund, J. S. Jayakumar, Kajal Parashar, S. Parashar   +4 more
semanticscholar   +1 more source

A regenerator—prediction of nusselt numbers

International Journal of Heat and Mass Transfer, 1969
Abstract The dynamics of a parallel plate regenerative heat exchanger are studied using a model in which resistance to heat transfer is due to diffusional resistance in the fluid in the direction transverse to flow. The resultant Nusselt number is a function of time as well as longitudinal distance from the entrance of the exchanger and is not a ...
Ralph E. Peck, Dimitri Gidaspow, Curtis A. Chase   +2 more
openaire   +2 more sources

Physical model of the dependence of the Nusselt number on the Rayleigh number [PDF]

Technical Physics, 2016
The dependence of the Nusselt number on the Rayleigh number at the stage preceding the turbulent regime of convection is substantiated and obtained in analytic form. At this stage, the Nusselt number can be described by the power dependence on the Rayleigh number, which contains five constants.
O. L. Patochkina, Viktor Tkachenko, Yu.G. Kazarinov   +2 more
openaire   +1 more source

Development of multilayer perceptron artificial neural network (MLP-ANN) and least square support vector machine (LSSVM) models to predict Nusselt number and pressure drop of TiO2/water nanofluid flows through non-straight pathways

Numerical Heat Transfer, Part A Applications, 2018
In this study, Multilayer Perceptron Artificial Neural Network (MLP-ANN) model and Least Square Support Vector Machine (LSSVM), were developed to predict the thermal performance and pressure loss of nanofluid flow through coils as non-straight pathways ...
M. Kahani, M. Ahmadi, A. Tatar, M. Sadeghzadeh   +3 more
semanticscholar   +1 more source

A New Nusselt Number for Complicated Configurations

Volume 3: Gas Turbine Heat Transfer; Transport Phenomena in Materials Processing and Manufacturing; Heat Transfer in Electronic Equipment; Symposium in Honor of Professor Richard Goldstein; Symposium in Honor of Prof. Spalding; Symposium in Honor of Prof. Arthur E. Bergles, 2013
Convective heat transfer over surfaces is generally presented in the form of the heat-transfer coefficient (h) or its nondimensional form, the Nusselt number (Nu). Both require the specification of the free-stream temperature (Too) or the bulk (Tb) temperature, which are clearly defined only for simple configurations.
Srisudarshan Krishna Sathyanarayanan, Tom I-Ping Shih   +1 more
openaire   +2 more sources

Nusselt number of a sphere in creeping flow

International Communications in Heat and Mass Transfer, 1990
Abstract Rates of heat or mass transfer from a spherical droplet translating in a field under creeping flow conditions are examined. The existing expressions for Nusselt numbers are evaluated via an independent numerical analysis.
D.L.R. Oliver, R.W. Ghrist
openaire   +2 more sources

A study of Nusselt and Sherwood numbers in a monolith reactor

Catalysis Today, 1999
Abstract A two-dimensional model of a single channel of a monolith reactor is used to evaluate the values of the Nusselt and Sherwood numbers under reaction conditions. The circular channel is assumed to have axisymmetry with a first-order reaction occurring at the wall.
Robert E. Hayes, Stan T. Kolaczkowski
openaire   +2 more sources

Nusselt number correlation for a jacketed stirred tank using computational fluid dynamics

Canadian Journal of Chemical Engineering, 2019
One of the biggest challenges related to mixing tanks is the heat exchange. Several studies have been developed to obtain Nusselt number correlations that represent the heat transfer coefficient by convection.
Silvia Araujo Daza, Ronald Jaimes Prada, J. Nunhez, G. Castilho   +3 more
semanticscholar   +1 more source

On the Monotonicity of the Nusselt Number as a Function of the Peclet Number

SIAM Journal on Applied Mathematics, 1994
Summary: The author considers an arbitrarily shaped body of finite extent that is kept at a constant temperature and immersed in an infinitely large fluid bath. If the temperature on the body is greater than the ambient temperature of the fluid, it is shown that the heat necessary to keep the body temperature fixed is a monotonically increasing ...
openaire   +3 more sources

Prandtl number dependence of Nusselt number in direct numerical simulations

Journal of Fluid Mechanics, 2000
The dependence of the Nusselt number Nu on the Rayleigh Ra and Prandtl Pr number is determined for 104 < Ra < 107 and 0.07 < Pr < 7 using DNS with no-slip upper and lower boundaries and free-slip sidewalls in a 8 × 8 × 2 box. Nusselt numbers, velocity scales and boundary layer thicknesses are calculated.
Robert M. Kerr, Jackson R. Herring
openaire   +3 more sources