The Experts below are selected from a list of 77679 Experts worldwide ranked by ideXlab platform
Zhibo Zhang - One of the best experts on this subject based on the ideXlab platform.
-
analytic model and frequency characteristics of plasma synthetic jet actuator
Physics of Fluids, 2015Co-Authors: Haohua Zong, Yun Wu, Yinghong Li, Huimin Song, Zhibo ZhangAbstract:This paper reports a novel analytic model of a plasma synthetic jet actuator (PSJA), considering both the Heat Transfer Effect and the inertia of the throat gas. Both the whole cycle characteristics and the repetitive working process of PSJA can be predicted with this model. The frequency characteristics of a PSJA with 87 mm3 volume and different orifice diameters are investigated based on the analytic model combined with experiments. In the repetitive working mode, the actuator works initially in the transitional stage with 20 cycles and then in the dynamic balanced stage. During the transitional stage, major performance parameters of PSJA experience stepped growth, while during the dynamic balanced stage, these parameters are characterized by periodic variation. With a constant discharge energy of 6.9 mJ, there exists a saturated frequency of 4 kHz/6 kHz for an orifice diameter of 1 mm/1.5 mm, at which the time-averaged total pressure of the pulsed jet reaches a maximum. Between 0.5 mm and 1.5 mm, a lar...
-
analytic model and frequency characteristics of plasma synthetic jet actuator
Physics of Fluids, 2015Co-Authors: Haohua Zong, Huimin Song, Zhibo Zhang, Min JiaAbstract:This paper reports a novel analytic model of a plasma synthetic jet actuator (PSJA), considering both the Heat Transfer Effect and the inertia of the throat gas. Both the whole cycle characteristics and the repetitive working process of PSJA can be predicted with this model. The frequency characteristics of a PSJA with 87 mm3 volume and different orifice diameters are investigated based on the analytic model combined with experiments. In the repetitive working mode, the actuator works initially in the transitional stage with 20 cycles and then in the dynamic balanced stage. During the transitional stage, major performance parameters of PSJA experience stepped growth, while during the dynamic balanced stage, these parameters are characterized by periodic variation. With a constant discharge energy of 6.9 mJ, there exists a saturated frequency of 4 kHz/6 kHz for an orifice diameter of 1 mm/1.5 mm, at which the time-averaged total pressure of the pulsed jet reaches a maximum. Between 0.5 mm and 1.5 mm, a larger orifice diameter leads to a higher saturated frequency due to the reduced jet duration time. As the actuation frequency increases, both the time-averaged cavity temperature and the peak jet velocity initially increase and then remain almost unchanged at 1600 K and 280 m/s, respectively. Besides, with increasing frequency, the mechanical energy incorporated in single pulsed jet, the expelled mass per pulse, and the time-averaged density in the cavity, decline in a stair stepping way, which is caused by the intermittent decrease of refresh stage duration in one period.
Haohua Zong - One of the best experts on this subject based on the ideXlab platform.
-
analytic model and frequency characteristics of plasma synthetic jet actuator
Physics of Fluids, 2015Co-Authors: Haohua Zong, Yun Wu, Yinghong Li, Huimin Song, Zhibo ZhangAbstract:This paper reports a novel analytic model of a plasma synthetic jet actuator (PSJA), considering both the Heat Transfer Effect and the inertia of the throat gas. Both the whole cycle characteristics and the repetitive working process of PSJA can be predicted with this model. The frequency characteristics of a PSJA with 87 mm3 volume and different orifice diameters are investigated based on the analytic model combined with experiments. In the repetitive working mode, the actuator works initially in the transitional stage with 20 cycles and then in the dynamic balanced stage. During the transitional stage, major performance parameters of PSJA experience stepped growth, while during the dynamic balanced stage, these parameters are characterized by periodic variation. With a constant discharge energy of 6.9 mJ, there exists a saturated frequency of 4 kHz/6 kHz for an orifice diameter of 1 mm/1.5 mm, at which the time-averaged total pressure of the pulsed jet reaches a maximum. Between 0.5 mm and 1.5 mm, a lar...
-
analytic model and frequency characteristics of plasma synthetic jet actuator
Physics of Fluids, 2015Co-Authors: Haohua Zong, Huimin Song, Zhibo Zhang, Min JiaAbstract:This paper reports a novel analytic model of a plasma synthetic jet actuator (PSJA), considering both the Heat Transfer Effect and the inertia of the throat gas. Both the whole cycle characteristics and the repetitive working process of PSJA can be predicted with this model. The frequency characteristics of a PSJA with 87 mm3 volume and different orifice diameters are investigated based on the analytic model combined with experiments. In the repetitive working mode, the actuator works initially in the transitional stage with 20 cycles and then in the dynamic balanced stage. During the transitional stage, major performance parameters of PSJA experience stepped growth, while during the dynamic balanced stage, these parameters are characterized by periodic variation. With a constant discharge energy of 6.9 mJ, there exists a saturated frequency of 4 kHz/6 kHz for an orifice diameter of 1 mm/1.5 mm, at which the time-averaged total pressure of the pulsed jet reaches a maximum. Between 0.5 mm and 1.5 mm, a larger orifice diameter leads to a higher saturated frequency due to the reduced jet duration time. As the actuation frequency increases, both the time-averaged cavity temperature and the peak jet velocity initially increase and then remain almost unchanged at 1600 K and 280 m/s, respectively. Besides, with increasing frequency, the mechanical energy incorporated in single pulsed jet, the expelled mass per pulse, and the time-averaged density in the cavity, decline in a stair stepping way, which is caused by the intermittent decrease of refresh stage duration in one period.
Min Jia - One of the best experts on this subject based on the ideXlab platform.
-
analytic model and frequency characteristics of plasma synthetic jet actuator
Physics of Fluids, 2015Co-Authors: Haohua Zong, Huimin Song, Zhibo Zhang, Min JiaAbstract:This paper reports a novel analytic model of a plasma synthetic jet actuator (PSJA), considering both the Heat Transfer Effect and the inertia of the throat gas. Both the whole cycle characteristics and the repetitive working process of PSJA can be predicted with this model. The frequency characteristics of a PSJA with 87 mm3 volume and different orifice diameters are investigated based on the analytic model combined with experiments. In the repetitive working mode, the actuator works initially in the transitional stage with 20 cycles and then in the dynamic balanced stage. During the transitional stage, major performance parameters of PSJA experience stepped growth, while during the dynamic balanced stage, these parameters are characterized by periodic variation. With a constant discharge energy of 6.9 mJ, there exists a saturated frequency of 4 kHz/6 kHz for an orifice diameter of 1 mm/1.5 mm, at which the time-averaged total pressure of the pulsed jet reaches a maximum. Between 0.5 mm and 1.5 mm, a larger orifice diameter leads to a higher saturated frequency due to the reduced jet duration time. As the actuation frequency increases, both the time-averaged cavity temperature and the peak jet velocity initially increase and then remain almost unchanged at 1600 K and 280 m/s, respectively. Besides, with increasing frequency, the mechanical energy incorporated in single pulsed jet, the expelled mass per pulse, and the time-averaged density in the cavity, decline in a stair stepping way, which is caused by the intermittent decrease of refresh stage duration in one period.
Huimin Song - One of the best experts on this subject based on the ideXlab platform.
-
analytic model and frequency characteristics of plasma synthetic jet actuator
Physics of Fluids, 2015Co-Authors: Haohua Zong, Yun Wu, Yinghong Li, Huimin Song, Zhibo ZhangAbstract:This paper reports a novel analytic model of a plasma synthetic jet actuator (PSJA), considering both the Heat Transfer Effect and the inertia of the throat gas. Both the whole cycle characteristics and the repetitive working process of PSJA can be predicted with this model. The frequency characteristics of a PSJA with 87 mm3 volume and different orifice diameters are investigated based on the analytic model combined with experiments. In the repetitive working mode, the actuator works initially in the transitional stage with 20 cycles and then in the dynamic balanced stage. During the transitional stage, major performance parameters of PSJA experience stepped growth, while during the dynamic balanced stage, these parameters are characterized by periodic variation. With a constant discharge energy of 6.9 mJ, there exists a saturated frequency of 4 kHz/6 kHz for an orifice diameter of 1 mm/1.5 mm, at which the time-averaged total pressure of the pulsed jet reaches a maximum. Between 0.5 mm and 1.5 mm, a lar...
-
analytic model and frequency characteristics of plasma synthetic jet actuator
Physics of Fluids, 2015Co-Authors: Haohua Zong, Huimin Song, Zhibo Zhang, Min JiaAbstract:This paper reports a novel analytic model of a plasma synthetic jet actuator (PSJA), considering both the Heat Transfer Effect and the inertia of the throat gas. Both the whole cycle characteristics and the repetitive working process of PSJA can be predicted with this model. The frequency characteristics of a PSJA with 87 mm3 volume and different orifice diameters are investigated based on the analytic model combined with experiments. In the repetitive working mode, the actuator works initially in the transitional stage with 20 cycles and then in the dynamic balanced stage. During the transitional stage, major performance parameters of PSJA experience stepped growth, while during the dynamic balanced stage, these parameters are characterized by periodic variation. With a constant discharge energy of 6.9 mJ, there exists a saturated frequency of 4 kHz/6 kHz for an orifice diameter of 1 mm/1.5 mm, at which the time-averaged total pressure of the pulsed jet reaches a maximum. Between 0.5 mm and 1.5 mm, a larger orifice diameter leads to a higher saturated frequency due to the reduced jet duration time. As the actuation frequency increases, both the time-averaged cavity temperature and the peak jet velocity initially increase and then remain almost unchanged at 1600 K and 280 m/s, respectively. Besides, with increasing frequency, the mechanical energy incorporated in single pulsed jet, the expelled mass per pulse, and the time-averaged density in the cavity, decline in a stair stepping way, which is caused by the intermittent decrease of refresh stage duration in one period.
Mostafa Keshavarz Moraveji - One of the best experts on this subject based on the ideXlab platform.
-
modeling of forced convective Heat Transfer of a non newtonian nanofluid in the horizontal tube under constant Heat flux with computational fluid dynamics
International Communications in Heat and Mass Transfer, 2012Co-Authors: Mostafa Keshavarz Moraveji, Seyyed Mohammad Hossein Haddad, Mehdi DarabiAbstract:Abstract In this paper, convective Heat Transfer Effect on the non-Newtonian nanofluid flow in the horizontal tube with constant Heat flux was investigated using computational fluid dynamics (CFD). For this purpose, non-Newtonian nanofluid containing Al2O3 and Xanthan aqueous solution as a liquid single phase with two average particle sizes of 45 and 150 nm and four particle concentrations of 1, 2, 4 and 6 wt.% and two concentrations of Xanthan aqueous solutions (0.6,1.0 wt.%) were used. Effect of particle size and concentration of Xanthan solution on convective Heat Transfer coefficient was investigated in different Reynolds numbers (500
-
modeling of convective Heat Transfer of a nanofluid in the developing region of tube flow with computational fluid dynamics
International Communications in Heat and Mass Transfer, 2011Co-Authors: Mostafa Keshavarz Moraveji, Mehdi Darabi, Seyyed Mohammad Hossein Haddad, Reza DavarnejadAbstract:Abstract In this article, convective Heat Transfer Effect on the nanofluid flow in the developing region of a tube with constant Heat flux was investigated using computational fluid dynamics (CFD). For this purpose, nanofluid containing Al 2 O 3 and water as a liquid single phase with two average particle sizes of 45 and 150 nm and four particle concentrations of 1, 2, 4 and 6 wt.% were used. Effect of particle size on convective Heat Transfer coefficient was investigated in different Reynolds numbers (500