Next Article in Journal
Estimation of Downtime and of Missed Energy Associated with a Wave Energy Converter by the Equivalent Power Storm Model
Next Article in Special Issue
Effect of Heterogeneity in Coal Ash Chemical Composition on the Onset of Conditions Favorable for Agglomeration in Fluid Beds
Previous Article in Journal
Molecular Simulation Studies of Flue Gas Purification by Bio-MOF
Previous Article in Special Issue
Chemical-Looping Combustion and Gasification of Coals and Oxygen Carrier Development: A Brief Review
Article Menu

Export Article

Open AccessArticle
Energies 2015, 8(10), 11546-11574; doi:10.3390/en81011546

Effects of Shear Dependent Viscosity and Variable Thermal Conductivity on the Flow and Heat Transfer in a Slurry

1
Department of Mechanical Engineering and Material Science, University of Pittsburgh, 3700 O’Hara Street, Pittsburgh, PA 15213, USA
2
Department of Energy, National Energy Technology Laboratory (NETL), 626 Cochrans Mill Road, P.O. Box 10940, Pittsburgh, PA 15236, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Vasily Novozhilov
Received: 5 August 2015 / Revised: 2 September 2015 / Accepted: 30 September 2015 / Published: 15 October 2015
(This article belongs to the Special Issue Recent Advances in Coal Combustion and Gasification)
View Full-Text   |   Download PDF [1947 KB, uploaded 15 October 2015]   |  

Abstract

In this paper we study the effects of variable viscosity and thermal conductivity on the heat transfer in the pressure-driven fully developed flow of a slurry (suspension) between two horizontal flat plates. The fluid is assumed to be described by a constitutive relation for a generalized second grade fluid where the shear viscosity is a function of the shear rate, temperature and concentration. The heat flux vector for the slurry is assumed to follow a generalized form of the Fourier’s equation where the thermal conductivity k depends on the temperature as well as the shear rate. We numerically solve the governing equations of motion in the non-dimensional form and perform a parametric study to see the effects of various dimensionless numbers on the velocity, volume fraction and temperature profiles. The different cases of shear thinning and thickening, and the effect of the exponent in the Reynolds viscosity model, for the temperature variation in viscosity, are also considered. The results indicate that the variable thermal conductivity can play an important role in controlling the temperature variation in the flow. View Full-Text
Keywords: non-linear fluids; variable viscosity; variable thermal conductivity; coal slurry; non-Newtonian fluids non-linear fluids; variable viscosity; variable thermal conductivity; coal slurry; non-Newtonian fluids
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Miao, L.; Massoudi, M. Effects of Shear Dependent Viscosity and Variable Thermal Conductivity on the Flow and Heat Transfer in a Slurry. Energies 2015, 8, 11546-11574.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Energies EISSN 1996-1073 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top