The Experts below are selected from a list of 18126 Experts worldwide ranked by ideXlab platform
Y. Gao - One of the best experts on this subject based on the ideXlab platform.
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buoyancy and Inertial Force on oscillations of thermal induced convective flow across a vent
Building and Environment, 2011Co-Authors: Wan Ki Chow, Y. GaoAbstract:Abstract Natural vents are commonly installed in buildings for smoke control. Air motion is induced by buoyancy of the thermal sources inside the building. Hot smoke is expected to be exhausted out of the vent. However, directions of air flowing across the vent might be oscillating under some conditions. The ratio B of buoyancy to Inertial Force defined by the Grashof number over the square of the Reynolds number is the key parameter in determining airflow oscillations. In this paper, effects of buoyancy, pressure, and the combined effect of buoyancy and pressure denoted by B will be studied by simple flow equations. A room fire with a horizontal vent is taken as an example. The results indicate that pressure is the driving Force for the airflow oscillations when B 10. However, the combined effect of pressure and buoyancy is important when B is close to 1. Results are useful for designing smoke exhaust systems with natural vents.
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Buoyancy and Inertial Force on oscillations of thermal-induced convective flow across a vent
Building and Environment, 2011Co-Authors: Wan Ki Chow, Y. GaoAbstract:Natural vents are commonly installed in buildings for smoke control. Air motion is induced by buoyancy of the thermal sources inside the building. Hot smoke is expected to be exhausted out of the vent. However, directions of air flowing across the vent might be oscillating under some conditions. The ratio B of buoyancy to Inertial Force defined by the Grashof number over the square of the Reynolds number is the key parameter in determining airflow oscillations.In this paper, effects of buoyancy, pressure, and the combined effect of buoyancy and pressure denoted by B will be studied by simple flow equations. A room fire with a horizontal vent is taken as an example. The results indicate that pressure is the driving Force for the airflow oscillations when B < 0.1. Buoyancy is the dominating factor when B > 10. However, the combined effect of pressure and buoyancy is important when B is close to 1. Results are useful for designing smoke exhaust systems with natural vents.Department of Building Services Engineerin
In-mook Kim - One of the best experts on this subject based on the ideXlab platform.
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Transition from stable to unstable growth by an Inertial Force.
Physical review. E Statistical nonlinear and soft matter physics, 2003Co-Authors: Kwangho Park, Jae Hwan Lee, In-mook KimAbstract:We introduce a simple growth model where the growth of the interface is affected by an Inertial Force and a white noise. The magnitude of the Inertial Force is controlled by a constant p between 0 and 1. An Inertial Force increases continuously from 0, as p does from 0 to 1. In our model, the interface starts growing from a flat state. When p
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Transition from stable to unstable growth by an Inertial Force.
Physical Review E, 2003Co-Authors: Kwangho Park, Jae Hwan Lee, In-mook KimAbstract:We introduce a simple growth model where the growth of the interface is affected by an Inertial Force and a white noise. The magnitude of the Inertial Force is controlled by a constant p between 0 and 1. An Inertial Force increases continuously from 0, as p does from 0 to 1. In our model, the interface starts growing from a flat state. When $pl{p}_{c},$ the interface width in our model increases continuously from 0 as time elapses, but it saturates to a constant value in the long time limit. The saturated values of the interface width are the same for different values of p if $pl{p}_{c}.$ When $pg{p}_{c},$ however, the interface width increases continuously without saturation as time elapses. We explain via simple calculation how this interesting phenomenon occurs in our model. We find ${p}_{c}=0.5$ from the calculation. This critical value is in excellent agreement with the critical value ${p}_{c}=0.50(1)$ found from the simulations of our model.
Sadamichi Maekawa - One of the best experts on this subject based on the ideXlab platform.
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Spin-dependent Inertial Force and spin current in accelerating systems
Bulletin of the American Physical Society, 2012Co-Authors: Mamoru Matsuo, Jun'ichi Ieda, Eiji Saitoh, Sadamichi MaekawaAbstract:The spin-dependent Inertial Force in an accelerating system under the presence of electromagnetic fields is derived from the generally covariant Dirac equation. Spin currents are evaluated by the Force up to the lowest order of the spin-orbit coupling in both ballistic and diffusive regimes. We give an interpretation of the Inertial effect of linear acceleration on an electron as an effective electric field and show that mechanical vibration in a high frequency resonator can create a spin current via the spin-orbit interaction augmented by the linear acceleration.
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Spin-dependent Inertial Force and spin current in accelerating systems
Physical Review B, 2011Co-Authors: Mamoru Matsuo, Jun'ichi Ieda, Eiji Saitoh, Sadamichi MaekawaAbstract:The spin-dependent Inertial Force in an accelerating system under the presence of electromagnetic fields is derived from the generally covariant Dirac equation. Spin currents are evaluated by the Force up to the lowest order of the spin-orbit coupling in both ballistic and diffusive regimes. We give an interpretation of the Inertial effect of linear acceleration on an electron as an effective electric field and show that mechanical vibration in a high frequency resonator can create a spin current via the spin-orbit interaction augmented by the linear acceleration.Comment: 11 pages,4 figure
Wan Ki Chow - One of the best experts on this subject based on the ideXlab platform.
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buoyancy and Inertial Force on oscillations of thermal induced convective flow across a vent
Building and Environment, 2011Co-Authors: Wan Ki Chow, Y. GaoAbstract:Abstract Natural vents are commonly installed in buildings for smoke control. Air motion is induced by buoyancy of the thermal sources inside the building. Hot smoke is expected to be exhausted out of the vent. However, directions of air flowing across the vent might be oscillating under some conditions. The ratio B of buoyancy to Inertial Force defined by the Grashof number over the square of the Reynolds number is the key parameter in determining airflow oscillations. In this paper, effects of buoyancy, pressure, and the combined effect of buoyancy and pressure denoted by B will be studied by simple flow equations. A room fire with a horizontal vent is taken as an example. The results indicate that pressure is the driving Force for the airflow oscillations when B 10. However, the combined effect of pressure and buoyancy is important when B is close to 1. Results are useful for designing smoke exhaust systems with natural vents.
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Buoyancy and Inertial Force on oscillations of thermal-induced convective flow across a vent
Building and Environment, 2011Co-Authors: Wan Ki Chow, Y. GaoAbstract:Natural vents are commonly installed in buildings for smoke control. Air motion is induced by buoyancy of the thermal sources inside the building. Hot smoke is expected to be exhausted out of the vent. However, directions of air flowing across the vent might be oscillating under some conditions. The ratio B of buoyancy to Inertial Force defined by the Grashof number over the square of the Reynolds number is the key parameter in determining airflow oscillations.In this paper, effects of buoyancy, pressure, and the combined effect of buoyancy and pressure denoted by B will be studied by simple flow equations. A room fire with a horizontal vent is taken as an example. The results indicate that pressure is the driving Force for the airflow oscillations when B < 0.1. Buoyancy is the dominating factor when B > 10. However, the combined effect of pressure and buoyancy is important when B is close to 1. Results are useful for designing smoke exhaust systems with natural vents.Department of Building Services Engineerin
Kwangho Park - One of the best experts on this subject based on the ideXlab platform.
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Transition from stable to unstable growth by an Inertial Force.
Physical review. E Statistical nonlinear and soft matter physics, 2003Co-Authors: Kwangho Park, Jae Hwan Lee, In-mook KimAbstract:We introduce a simple growth model where the growth of the interface is affected by an Inertial Force and a white noise. The magnitude of the Inertial Force is controlled by a constant p between 0 and 1. An Inertial Force increases continuously from 0, as p does from 0 to 1. In our model, the interface starts growing from a flat state. When p
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Transition from stable to unstable growth by an Inertial Force.
Physical Review E, 2003Co-Authors: Kwangho Park, Jae Hwan Lee, In-mook KimAbstract:We introduce a simple growth model where the growth of the interface is affected by an Inertial Force and a white noise. The magnitude of the Inertial Force is controlled by a constant p between 0 and 1. An Inertial Force increases continuously from 0, as p does from 0 to 1. In our model, the interface starts growing from a flat state. When $pl{p}_{c},$ the interface width in our model increases continuously from 0 as time elapses, but it saturates to a constant value in the long time limit. The saturated values of the interface width are the same for different values of p if $pl{p}_{c}.$ When $pg{p}_{c},$ however, the interface width increases continuously without saturation as time elapses. We explain via simple calculation how this interesting phenomenon occurs in our model. We find ${p}_{c}=0.5$ from the calculation. This critical value is in excellent agreement with the critical value ${p}_{c}=0.50(1)$ found from the simulations of our model.
