Wakeham, W. A. Department of Chemical Engineering and Chemical Technology, Inperial College of Science and Technology, London, United Kingdom.
Assael, M. J. Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki, Greece.
- Thermal conduction
- Thermal processes
- Transport coefficients
- Additional Readings
The processes whereby mass, energy, or momentum are transported from one region of a material to another under the influence of composition, temperature, or velocity gradients. If a sample of a material in which the chemical composition, the temperature, or the velocity varies from point to point is isolated from its surroundings, the transport processes act so as eventually to render these quantities uniform throughout the material. The nonuniform state required to generate these transport processes causes them to be known also as nonequilibrium processes. Associated with gradients of composition, temperature, and velocity in a material are the transport processes of diffusion, thermal conduction, and viscosity, respectively. For a large class of materials, the laws that govern the transport processes are quite simple.
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