Heating and Cooling Anomaly of a Rotating Body

Authors

  • O. Brůha
  • T. Brůha

DOI:

https://doi.org/10.14311/664

Keywords:

angular momentum, energy conservation, rotating body, thermal expansion

Abstract

This paper deals with an effect which appears when heating or cooling a rotating body. No external forces acting on the body are supposed. Due to thermal expansion, the moment of inertia of the body varies together with the temperature changes. In agreement with the principle of conservation of angular momentum [1], the angular momentum is constant. This results in angular velocity changes and subsequently in kinetic energy changes. Also the stress energy varies together with the changes in thermal dimension. To satisfy the principle of energy conservation we have to suppose that the changes in kinetic and stress energy are compensated by the changes in internal energy, which is correlated with temperature changes of the body. This means that the rules for the heating or cooling process of a rotating body are not the same as those for a body at rest. This idea, applied to a cylinder rotating around its geometric axis under specific parameters, has been mathematically treated. As a result, the difference between the final temperature of the rotating cylinder and the temperature of the cylinder at rest has been found. 

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Author Biographies

O. Brůha

T. Brůha

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Published

2005-01-01

How to Cite

Brůha, O., & Brůha, T. (2005). Heating and Cooling Anomaly of a Rotating Body. Acta Polytechnica, 45(1). https://doi.org/10.14311/664

Issue

Section

Articles