jiaojiao Pang | Tsinghua University (original) (raw)
Papers by jiaojiao Pang
Physics Today, Sep 1, 2004
arXiv (Cornell University), Jan 26, 2015
Bulletin of the American Physical Society, Nov 21, 2011
Description/Abstract Laboratory experiments were conducted in a wind-wave tank to study the turbu... more Description/Abstract Laboratory experiments were conducted in a wind-wave tank to study the turbulent characteristics in the water boundary-layers under the action of wind and waves and to study the oil dispersion characteristics under the action of breaking waves. Effects of an oil slick on the wind-waves or mechanically-generated waves with wind were also investigated. The objective was to understand by means of laboratory experiments the behavior of oil dispersion in the upper ocean. Two new instruments, a laser Doppler ...
Infotech@Aerospace, Jun 15, 2005
Two preliminary concepts of propulsion based on a bacterial flagellum motor (BFM) were developed ... more Two preliminary concepts of propulsion based on a bacterial flagellum motor (BFM) were developed with the potential for use in micro-air-vehicles (MAV). The first uses the conventional turbojet without the turbine with a BFM to run the compressor. The second concept uses the ...
AIAA Journal, Jul 1, 1992
Cambridge University Press eBooks, Aug 15, 2000
Mechanical engineering series, Sep 27, 2001
Journal of Fluid Mechanics, Aug 26, 2015
CRC Press eBooks, Jul 17, 2019
Natural Hazards Review, Feb 1, 2010
Facets and scope of large-scale disasters are briefly discussed in this forum. A universal quanti... more Facets and scope of large-scale disasters are briefly discussed in this forum. A universal quantitative metric is proposed that puts all natural and human-derived disasters on a common scale. Issues of prediction, control, and mitigation of catastrophes are broadly introduced. The laws of nature govern the evolution of any disaster. In some cases, as for example weather-related disasters, those first-principles laws could be written in the form of field equations, but exact solutions of these often nonlinear differential equations are impossible to obtain, particularly for turbulent flows; heuristic models together with intensive use of supercomputers are necessary to proceed. In other cases, as for example earthquakes, the precise laws are not even known and prediction becomes somewhat problematic. Management of any type of disaster is more art than science. Nevertheless, much can be done by both social and physical scientists/engineers to alleviate the resulting pain and suffering.
Proceedings of SPIE, Jul 24, 2003
Manufacturing processes that can create extremely small machines have been developed in recent ye... more Manufacturing processes that can create extremely small machines have been developed in recent years. Microelectromechanical systems (MEMS) refer to devices that have characteristic length of less than 1 mm but more than 1 micron, that combine electrical and ...
Springer eBooks, 1989
Among the modem goals of external flow control are separation postponement, lift enhancement, tra... more Among the modem goals of external flow control are separation postponement, lift enhancement, transition delay or advancement, and drag reduction. These objectives are not necessarily mutually exclusive. For low-Reynolds-number lifting surfaces, where the formation of a laminar separation bubble may have a dominant effect on the flow field, the interrelation between the above goals is particularly salient, presenting an additional degree of complexity. The present article is an overview of passive and active techniques used to control a low-Reynolds-number boundary layer to achieve an improved performance. A unified view based on a vorticity framework will be presented to explain many of the available or contemplated control methods. Among the control techniques to be considered are wall suction/injection, shaping, heat transfer through the surface, introduction of a foreign substance into the boundary layer, fixed or moving geometric modifications, and turbulence manipulation. Among the practical considerations that will be reviewed for these devices are their cost of construction and operation, complexity, and potential trade-off’s or penalties associated with their use.
Cambridge University Press eBooks, Aug 15, 2000
Physics of Fluids, Jul 1, 2013
Lecture notes in engineering, 1989
Abstract The ability to actively or passively manipulate a flow field to effect a desired change ... more Abstract The ability to actively or passively manipulate a flow field to effect a desired change is of immense technological importance. In this article, methods of control to achieve transition delay, separation postponement, lift enhancement, drag reduction, turbulence ...
Physics Today, Sep 1, 2004
arXiv (Cornell University), Jan 26, 2015
Bulletin of the American Physical Society, Nov 21, 2011
Description/Abstract Laboratory experiments were conducted in a wind-wave tank to study the turbu... more Description/Abstract Laboratory experiments were conducted in a wind-wave tank to study the turbulent characteristics in the water boundary-layers under the action of wind and waves and to study the oil dispersion characteristics under the action of breaking waves. Effects of an oil slick on the wind-waves or mechanically-generated waves with wind were also investigated. The objective was to understand by means of laboratory experiments the behavior of oil dispersion in the upper ocean. Two new instruments, a laser Doppler ...
Infotech@Aerospace, Jun 15, 2005
Two preliminary concepts of propulsion based on a bacterial flagellum motor (BFM) were developed ... more Two preliminary concepts of propulsion based on a bacterial flagellum motor (BFM) were developed with the potential for use in micro-air-vehicles (MAV). The first uses the conventional turbojet without the turbine with a BFM to run the compressor. The second concept uses the ...
AIAA Journal, Jul 1, 1992
Cambridge University Press eBooks, Aug 15, 2000
Mechanical engineering series, Sep 27, 2001
Journal of Fluid Mechanics, Aug 26, 2015
CRC Press eBooks, Jul 17, 2019
Natural Hazards Review, Feb 1, 2010
Facets and scope of large-scale disasters are briefly discussed in this forum. A universal quanti... more Facets and scope of large-scale disasters are briefly discussed in this forum. A universal quantitative metric is proposed that puts all natural and human-derived disasters on a common scale. Issues of prediction, control, and mitigation of catastrophes are broadly introduced. The laws of nature govern the evolution of any disaster. In some cases, as for example weather-related disasters, those first-principles laws could be written in the form of field equations, but exact solutions of these often nonlinear differential equations are impossible to obtain, particularly for turbulent flows; heuristic models together with intensive use of supercomputers are necessary to proceed. In other cases, as for example earthquakes, the precise laws are not even known and prediction becomes somewhat problematic. Management of any type of disaster is more art than science. Nevertheless, much can be done by both social and physical scientists/engineers to alleviate the resulting pain and suffering.
Proceedings of SPIE, Jul 24, 2003
Manufacturing processes that can create extremely small machines have been developed in recent ye... more Manufacturing processes that can create extremely small machines have been developed in recent years. Microelectromechanical systems (MEMS) refer to devices that have characteristic length of less than 1 mm but more than 1 micron, that combine electrical and ...
Springer eBooks, 1989
Among the modem goals of external flow control are separation postponement, lift enhancement, tra... more Among the modem goals of external flow control are separation postponement, lift enhancement, transition delay or advancement, and drag reduction. These objectives are not necessarily mutually exclusive. For low-Reynolds-number lifting surfaces, where the formation of a laminar separation bubble may have a dominant effect on the flow field, the interrelation between the above goals is particularly salient, presenting an additional degree of complexity. The present article is an overview of passive and active techniques used to control a low-Reynolds-number boundary layer to achieve an improved performance. A unified view based on a vorticity framework will be presented to explain many of the available or contemplated control methods. Among the control techniques to be considered are wall suction/injection, shaping, heat transfer through the surface, introduction of a foreign substance into the boundary layer, fixed or moving geometric modifications, and turbulence manipulation. Among the practical considerations that will be reviewed for these devices are their cost of construction and operation, complexity, and potential trade-off’s or penalties associated with their use.
Cambridge University Press eBooks, Aug 15, 2000
Physics of Fluids, Jul 1, 2013
Lecture notes in engineering, 1989
Abstract The ability to actively or passively manipulate a flow field to effect a desired change ... more Abstract The ability to actively or passively manipulate a flow field to effect a desired change is of immense technological importance. In this article, methods of control to achieve transition delay, separation postponement, lift enhancement, drag reduction, turbulence ...