Summary
A variational principle for forced convection in laminar flow in uniform channels is formulated. The concepts of thermal potential, dissipation function and thermal force have been introduced and a Lagrangian formulation of the thermal flow field using generalized coordinates is given. Special consideration is given to heat transfer in plug flow when the thermal field is a linear function of the generalized coordinates. The concept of normal and ignorable coordinates is introduced. An example showing the use of Lagrangian equations is worked out.
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Gupta, S.C. A variational principle for fully developed laminar heat transfer in uniform channels I. Appl. sci. Res. 10, 85 (1961). https://doi.org/10.1007/BF00411901
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DOI: https://doi.org/10.1007/BF00411901