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Questions related from Heinz Herwig
In many cooling problems the phrase "dissipated heat which should be removed" appears. Isn't that misleading since heat is a process quantity and dissipation usually means the conversion of...
02 February 2015 4,131 4 View
According to ASME standards validation of a physical/mathematical model has to be done by comparing model predictions with the "real world", i.e. with experimental results. Often, however, no...
01 January 2015 525 48 View
From a thermodynamics point of view heat transfer and entropy are very closely related, for example by the fundamental equation dQ=TdS for reversible heat transfer. If, however, one goes to the...
11 November 2014 4,615 6 View
From my long time experience in teaching thermodynamics for engineers I come to the conclusion that "enthalpy" as combination of inner energy and the product of pressure and specific volume...
08 August 2014 3,566 15 View
From my point of view the phrase "secondary flow" was coined in a time where real three-dimensional flows could not be calculated. The one dimensional approximation (Bernoulli-equation) was the...
07 July 2014 1,886 17 View
Some years ago a group of scientists introduced the thermodynamic quantity "entransy" claiming that such a quantity is missing especially in analysing heat transfer problems. There are doubts,...
07 July 2014 4,905 4 View
