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A Note on Flow Regimes and Churning Loss Modelling
Volume 8: 11th International Power Transmission and Gearing Conference; 13th International Conference on Advanced Vehicle and Tire Technologies, 2011 The purpose of this study is to investigate the various fluid flow regimes generated by a pinion running partly immersed in an oil bath and the corresponding churning power losses. In a series of papers, the authors have established several loss formulae whose validity depends on two different flow regimes characterized via a critical Reynolds number ...
Changenet, Christophe +3 more
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A Model for the Prediction of Churning Losses in Geared Transmissions—Preliminary Results
Journal of Mechanical Design, 2006 A series of formulas are presented which enable accurate predictions of churning losses for one pinion characteristic of automotive transmission geometry. The results are based on dimensional analysis and have been experimentally validated over a wide range of speeds, gear geometries, lubricants, and immersion depths.
Changenet, Christophe, Velex, Philippe
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International Journal of Heat and Mass Transfer, 2018
The speed of Electro-Hydrostatic Actuator (EHA) pump can recently reach a maximum of 20,000 rpm due to its high power density requirements. The thermodynamics of EHA pumps become increasingly important because the oil in the casing is used to cooling the
Junhui Zhang, Min Pan, Ying Li
exaly +2 more sources
The speed of Electro-Hydrostatic Actuator (EHA) pump can recently reach a maximum of 20,000 rpm due to its high power density requirements. The thermodynamics of EHA pumps become increasingly important because the oil in the casing is used to cooling the
Junhui Zhang, Min Pan, Ying Li
exaly +2 more sources
Development of an analytical model to estimate the churning power losses of a spiral bevel gear
Tribology International, 2020A quasi-analytical model based on fluid mechanics is established to estimate the no-load power losses of a spiral bevel gear with splash lubrication. The no-load losses are defined as the sum of churning power loses and windage power losses.
Xiang Zhu
exaly +2 more sources
A Novel Prediction Model for Churning Power Loss of Spur Gear
Lubrication ScienceABSTRACTThe prediction of churning power loss has been a difficult problem in the analysis of spur gears. Thus, an analytical prediction model based on the redefinition of churning power loss and energy transformation is proposed to estimate the churning power of spur gears. Churning power loss is defined as the combination of the power loss due to the
Fuchun Jia
exaly +2 more sources
Analysis of churning losses distribution of hydraulic pump in engineering vehicles using MPS method
Proceedings of the Institution of mechanical engineers. Part D, journal of automobile engineering, 2022The power losses of the hydraulic pump in engineering vehicle include mechanical losses, churning losses, and volume losses. The proportion of churning losses to power losses increases markedly, with the continuous improvement of the rotating speed of ...
Chun-Hui Wei +5 more
semanticscholar +1 more source
, 2019 Sufficient oil supply of all machine elements in gearboxes is usually required to avoid damage during operation. Quite frequently, transmissions are conservatively designed with an oversupply of oil to guarantee operational reliability. An oversupply of
Hua Liu +6 more
semanticscholar +2 more sources
390. The estimation of losses of butterfat in churning
Journal of Dairy Research, 1949The Bird & Derby method of calculating percentage butterfat loss in buttermilk is in error because it assumes that all the buttermilk in the granules at draining is retained in the buttermilk, whereas much of it is washed out in the wash water. Lactose estimations in butter and buttermilk confirm Udy's finding that butter contains about 10% of ...
F. H. McDowall, A. K. R. McDowell
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An experimental investigation of windage and oil churning power losses of gears and discs
Proceedings of the Institution of mechanical engineers. Part J, journal of engineering tribology, 2022This study presents comparable sets of churning and windage power loss measurements of a gear. Measurements are performed under windage (air only) and churning (immersion in oil up to a certain level) to quantify load-independent power losses of a family
M. Handschuh, A. Guner, A. Kahraman
semanticscholar +1 more source
Tribology International, 2021
To study the influence of dynamic flight attitudes on the splash lubrication performance and churning power losses of the intermediate spiral bevel gearbox in a helicopter, a three-dimensional (3D) simulation model consisting of a spiral bevel gear pair,
Xiao-Zhou Hu +3 more
semanticscholar +1 more source
To study the influence of dynamic flight attitudes on the splash lubrication performance and churning power losses of the intermediate spiral bevel gearbox in a helicopter, a three-dimensional (3D) simulation model consisting of a spiral bevel gear pair,
Xiao-Zhou Hu +3 more
semanticscholar +1 more source