A perpetual-motion machine problem for teaching fluid mechanics and thermodynamics

被引：2
作者：
Naylor, David [1 ]
机构：
[1] Department of Mechanical and Industrial Engineering, Ryerson University, Toronto, ON M5B 2K3
来源：
International Journal of Mechanical Engineering Education | 2009年 / 37卷 / 03期
关键词：
Fluid mechanics; Perpetual motion; Thermodynamics; Thought experiment;
D O I：
10.7227/IJMEE.37.3.3
中图分类号：
学科分类号：
摘要：
A perpetual-motion machine (PMM) problem is described which the author has used for more than a decade to augment a traditional textbook-centred course. Two proofs for debunking a 'buoyancy engine' PMM are given. One solution is based on the principles of fluid statics, requiring the calculation of hydrostatic and buoyancy forces on submerged surfaces. An alternative solution is based on an energy method, requiring the calculation of the work done by a moving boundary. These analyses are well suited for instructional purposes on a first course in fluid mechanics or thermodynamics. The author has found that this type of puzzle can be used to generate a high level of student interest and classroom participation, with only a minor commitment of lecture time.
引用
收藏
页码：187 / 196
页数：9
相关论文
共 11 条
  • [1] Cengel A.Y., Boles M.A., Thermodynamics. An Engineering Approach, pp. 263-265, (2002)
  • [2] Brigman G.H., The Martini perpetual motion machine: A semiprogrammed problem, American Journal of Physics, 40, 7, pp. 1001-1003, (1972)
  • [3] Thomson E.A., Students compete to design a perpetual-motion machine, MIT Tech Talk, (1998)
  • [4] Accreditation Criteria and Procedures, (2006)
  • [5] Klassen S., The science thought experiment: How might it be used profitably in the classroom?, Interchange, 37, 1-2, pp. 77-96, (2006)
  • [6] Gilbert J.K., Thought experiments in science education: Potential and current realization, International Journal of Science Education, 22, 3, pp. 265-283, (2000)
  • [7] Reiner M., Burko L.M., On the limitations of thought experiments in physics and the consequences for physics education, Science and Education, 12, pp. 365-385, (2003)
  • [8] Sorensen R.A., Thought Experiments, (1992)
  • [9] Simanek D.E., The Museum of Unworkable Devices, (2007)
  • [10] Read B., A professor's online museum explores the hidden history of perpetual-motion schemes, Chronicle of Higher Education, (2003)
12