91撸色 announces that Richard Price, Massachusetts Institute of Technology, will assume the position of Editor for the听 American Journal of Physics in September 2017, following the term of David P. Jackson.
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March 2017 Issue, Volume 85, No. 3
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by Joseph Beals IV. DOI: 10.1119/1.4973374
The reverse sprinkler problem popularized in Richard Feynman鈥檚 memoirs has long been a source of interest and controversy. Numerous theoretical and experimental studies have illuminated many important facets of the problem, yet disparities persist between theory and experiment. This work considers, for the first time, the spatial distribution of inertial and pressure forces on the sprinkler arms. Differences in the regions over which internal and external forces act constitute a forcecouple with different moment arms consistent with reverse rotation. Two novel sprinkler forms are presented, in principle capable of forward-only and reverse-only rotation, to elucidate specific features of this concept. It is also seen that the resulting flow-field asymmetry developed downstream from the sprinkler-arm bends supports the role of vortices in reverse sprinkler rotation by suggesting a mechanism for generating vortices in a consistent direction. The experimental challenges of isolating specific forces in light of both non-conservative forces and the influence of device design are also discussed. VC 2017 91撸色.
Papers
by Joseph Beals IV. DOI: 10.1119/1.4973374
by Simon Fleming. DOI: 10.1119/1.4972243
by B. Shayak. DOI: 10.1119/1.4973370
by Tom Claessens. DOI: 10.1119/1.4973427
by Amir Aghamohammadi, M. Ebrahim Foulaadvand, Mohammad Hassan Yaghoubi, and Amir Hossein Mousavi. DOI: 10.1119/1.4972176
by Ashok K. Singal. DOI: 10.1119/1.4972246
by F. Momeni, H. Papei, R. Jamshidzadeh, S. Bereliani, A. Miri more.... DOI: 10.1119/1.4967847
by F. Bouquet, J. Bobroff, M. Fuchs-Gallezot, and L. Maurines. DOI: 10.1119/1.4972043
by Hyewon Jang, Nathaniel Lasry, Kelly Miller, and Eric Mazur. DOI: 10.1119/1.4974744
LETTER TO THE EDITOR
by Craig F. Bohren. DOI: 10.1119/1.4975385
NOTES AND DISCUSSIONS
by Chula P. Abayaratne, and Vibodha Bandara. DOI: 10.1119/1.4971159
BOOK REVIEWS
by Thomas F. Jordan. DOI: 10.1119/1.4972266
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Additional Resources
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