Numerical comparison of saw-tooth plasma actuators for film cooling flow control over a flat plate

Li, Guozhan; Huang, Yingjie; Zhang, Hongjun; Yan, Weiwei; Nie, Deming

doi:10.1016/j.ijthermalsci.2020.106807

Cited by 7 publications

(2 citation statements)

References 30 publications

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“…Because of some unique advantages of using the EHD technique, it has been widely investigated for increasing heat transfer as a method. Some examples for the application of the EHD technique are cooling heat sink (Tang et al , 2020; Joppolo et al , 2012; Nourdanesh and Ranjbar (2022); Zhang et al , 2019; Wang et al , 2013; Fazlollahi and Alemrajabi, 2018), solar collectors and chimney (Nourdanesh et al , 2020; Haghighat et al , 2019), air-cooled photovoltaic/thermal systems (Golzari et al , 2018), solar air heater (Kasayapanand and Kiatsiriroat, 2006), condensation (Mohammadi et al , 2021; Sadek et al , 2010), single-phase and two-phase heat and mass transfer (Alamgholilou and Esmaeilzadeh, 2012; Lohrasbi et al , 2017), mixing (Jalaal et al , 2013), boiling (Nangle-Smith and Cotton, 2019; Nangle-Smith and Cotton, 2018), heat pump systems (Trommelmans and Berghmans, 1986), air conditioning systems (Ohadi, 1991), film cooling (Jafari et al , 2020; Li et al , 2021), drying (Iranshahi et al , 2020; Dolati et al , 2018), defrosting systems (Rijing et al , 2020; Malik et al , 2020) and others. Compact size, simple design, no moving parts, noiselessness and insignificant electricity consumption (Seyed-Yagoobi and Bryan, 1999) are the reasons for this wide attention.…”

Section: Introductionmentioning

confidence: 99%

Introduction of a novel electric field-based plate heat sink for heat transfer enhancement of thermal systems

Nourdanesh

Ranjbar

2021

HFF

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Purpose The purpose of this study is to use an electric field technique to design novel heat sinks capable of rejecting as much heat as possible in a limited space. Configuration of electrodes in this study can be used for increasing the efficiency of heat sinks. Design/methodology/approach This study investigates a novel electrohydrodynamic (EHD)-based heat sink for thermal management of electronic devices and thermal systems. The significant part of designing an EHD heat sink is the arrangement of the electrodes. A numerical simulation is performed for a heat sink with two parallel plates to determine the optimum dimensional configuration of electrodes. The upper plate of this heat sink is the ground electrode with a constant atmosphere temperature, and the lower plate of it with flush-mounted high-voltage electrodes has uniform heat flux. Findings The results show that heat transfer changes by the size of the vortices and the number of them. These vortices are emerged by the electric field, and the number of them increases with increasing the number of electrodes. The interaction of vortices size and number leads to having the lowest average temperature in the optimum case by two high voltage electrodes with widths of 7.5 mm and a 17.5 mm gap between them. In comparison with the case without the electric field, with increasing the applied voltage to 30 kV, the efficiency of this EHD heat sink increases up to 37%. Originality/value Improvements in electrical equipment make them more compact with higher heat fluxes. Hence, the amount of heat to be dissipated per area increases and needs thermal management to operate at their design temperatures. Therefore, to improve the performance and life span of electronic components and increase their efficiency, it is necessary to design heat sinks to decrease their maximum (peak) temperature.

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Section: Introductionmentioning

confidence: 99%

Introduction of a novel electric field-based plate heat sink for heat transfer enhancement of thermal systems

Nourdanesh

Ranjbar

2021

HFF

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“…Results showed that normal height of the coolant air increased when the applied voltage decreased from 14 kV to 0 kV. Li et al [11] studied an effect of a saw-tooth plasma actuator (STPA) on film cooling by adopting large eddy simulation method. Consequences showed that the cooling effectiveness in the case with STPA-on-tip was 28.1% lower than that with STPA-off.…”

Section: Introductionmentioning

confidence: 99%

Effect of dielectric barrier discharge plasma on film cooling performance

et al. 2022

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To improve film cooling effectiveness of a gas turbine blade, a kind of plasma actuator is introduced on the blade surface. The effect of three arrangements of plasma actuators on flow characteristics and film cooling performance is numerically investigated by a verified turbulence model. Results show that the coolant air under plasma is pulled down to the wall, and the near-wall air is sped up to promote the film cooling effectiveness downstream the wall. It is discovered that the plasma actuators near the film hole show weaker aerodynamic actuation than that downstream the wall. Compared with the plasma actuators off case, the maximum improvement in the wall-averaged film cooling effectiveness of the case with up plasma actuators is 11.7% under low blowing ratios. The wall-averaged film cooling effectivenesses of the cases with down plasma actuators and up-down plasma actuators increase by 138.3% and 122.9% under the blowing ratio of 1.5.. Vortex structures are broken up, and vortex is separated by two jets induced by aerodynamic actuation. The maximum wall pressure difference reaches 1.89% when plasma actuator is arranged downstream the wall.

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Large eddy simulations of the turbine vane pressure side film cooling flows of cylindrical and fan-shaped holes with a saw-tooth plasma actuator

Li,

Zhang,

Shen

et al. 2024

Applied Thermal Engineering

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Numerical comparison of saw-tooth plasma actuators for film cooling flow control over a flat plate

Cited by 7 publications

References 30 publications

Introduction of a novel electric field-based plate heat sink for heat transfer enhancement of thermal systems

Introduction of a novel electric field-based plate heat sink for heat transfer enhancement of thermal systems

Effect of dielectric barrier discharge plasma on film cooling performance

Large eddy simulations of the turbine vane pressure side film cooling flows of cylindrical and fan-shaped holes with a saw-tooth plasma actuator

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