Numerical investigation of chaotic flow in a 2D closed-loop pulsating heat pipe

Pouryoussefi, S.M.; Zhang, Kun

doi:10.1016/j.applthermaleng.2015.12.097

Cited by 79 publications

(40 citation statements)

References 20 publications

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“…This so-called dynamic boundary condition results in the adjustment of the curvature of the surface near the wall. If is the contact angle at the wall, then the surface normal at the live cell next to the wall is [26]: (13) where and ̂ are the unit vectors normal and tangential to the wall, respectively.…”

Section: Physical Modelingmentioning

confidence: 99%

“…Internal enthalpy balancing in the form of latent heat takes place by evaporation mass transfer from the liquid to the vapor plugs whereby saturation conditions are always imposed on the system during the bulk transient in the adiabatic section [21]. Sometimes two vapor bubbles combine together to form a larger vapor slug [26]. Such a combination process in evaporator and adiabatic section is illustrated in Fig.…”

Section: Volume Fractionsmentioning

confidence: 99%

“…The statistical average of a certain signal or sort of signal (including noise) as analyzed in terms of its frequency content is called its spectrum. Power spectrum density can be defined as [26]:…”

Section: Spectral Analysis Of Time Seriesmentioning

confidence: 99%

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Nonlinear Analysis of Chaotic Flow in a Three-Dimensional Closed-Loop Pulsating Heat Pipe

Pouryoussefi

Zhang

2016

Journal of Heat Transfer

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Numerical simulation has been conducted for the chaotic flow in a 3D closed-loop pulsating heat pipe (PHP). Heat flux and constant temperature boundary conditions were applied for evaporator and condenser sections, respectively. Water and ethanol were used as working fluids. Volume of Fluid (VOF) method has been employed for two-phase flow simulation. Spectral analysis of temperature time series was carried out using Power Spectrum Density (PSD) method. Existence of dominant peak in PSD diagram indicated periodic or quasi-periodic behavior in temperature oscillations at particular frequencies. Correlation dimension values for ethanol as working fluid was found to be higher than that for water under the same operating conditions. Similar range of Lyapunov exponent values for the PHP with water and ethanol as working fluids indicated strong dependency of Lyapunov exponent to the structure and dimensions of the PHP. An O-ring structure pattern was obtained for reconstructed 3D attractor at periodic or quasi-periodic behavior of temperature oscillations. Minimum thermal resistance of 0.85 ˚C/W and 0.88 ˚C/W were obtained for PHP with water and ethanol, respectively. Simulation results showed good agreement with experimental results from other work under the same operating conditions.

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Section: Physical Modelingmentioning

confidence: 99%

Section: Volume Fractionsmentioning

confidence: 99%

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Nonlinear Analysis of Chaotic Flow in a Three-Dimensional Closed-Loop Pulsating Heat Pipe

Pouryoussefi

Zhang

2016

Journal of Heat Transfer

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“…The results showed that the fluid flow finally circulates in one direction (clockwise or counterclockwise) in the pulsating heat pipe. This direction is based on a random process and could be different even under the same operating and boundary conditions [17]. It is seen that by increasing the wall temperature, the liquid film thickness around the vapor plugs decreases.…”

Section: Physical Modelingmentioning

confidence: 99%

“…Tracking of the interfaces between the phases is accomplished by the solution of a continuity equation for the volume fraction of one (or more) of the phases. For the q th phase, this equation has the following form [17]:…”

Section: Physical Modelingmentioning

confidence: 99%

Analysis of chaotic flow in a 2D multi-turn closed-loop pulsating heat pipe

Pouryoussefi

Zhang

2017

Applied Thermal Engineering

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Numerical study has been conducted for the chaotic flow in a multi-turn closed-loop pulsating heat pipe (PHP). Heat flux and constant temperature boundary conditions have been applied for heating and cooling sections respectively. Water was used as working fluid. Volume of Fluid (VOF) method has been employed for two-phase flow simulation. Volume fraction results showed formation of perfect vapor and liquid plugs in the fluid flow of PHP. Non-linear time series analysis, power spectrum density, correlation dimension and autocorrelation function were used to investigate the chaos. Absence of dominating peaks in the power spectrum density was a signature of chaos in the pulsating heat pipe. It was found that by increasing the filling ratio and evaporator heating power the correlation dimension increases. Decreasing of the autocorrelation function with respect to time showed the prediction ability is finite as a result of chaotic state. An optimal filling ratio of 60% and minimum thermal resistance of 1.62 ˚C/W were found for better thermal performance of the pulsating heat pipe.

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Opportunities, challenges, and state of the art of flexible heat‐pipe heat exchangers: A comprehensive review

V. K.

2023

Heat Trans

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Heat pipes (HPs) play a pivotal role in efficiently managing the thermal challenges posed by high heat flux devices. To facilitate their operation at extremely low temperatures, specialized working fluids with low‐boiling points are a necessity. HPs serve as efficient heat exchanger (HEX) in diverse applications, such as heat pumps and heat‐transfer components. In the realm of space applications, HP is indispensable for cooling electronic components within two‐phase thermal control systems. Notably, the recent significant reduction in HP production costs has paved the way for synergizing HP with HEX, promising substantial energy savings. This comprehensive review centers its focus on the advancements in HEX‐based flexible HP systems. It critically evaluates various performance models and investigates key findings from a multitude of literature papers that pertain to HEX applications. The review encompasses a wide spectrum of innovations, including conventional, pulsating, and thermosyphons (gravity‐assisted) in HEX. It further explores studies on recuperative and regenerative HEX configurations. The surveyed literature underscores the critical role played by the choice of operating fluid and heat load in significantly influencing HP performance. This study offers a comprehensive understanding of key outcomes, strengths, limitations, and specific applications of HP and HEX. The review also highlights the significance of operating fluid selection and considerations related to heat load while outlining exciting opportunities for future research in this domain. Moreover, it introduces several novel concepts for future studies in pertinent domains, offering promising directions for further exploration within this field.

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Numerical investigation of chaotic flow in a 2D closed-loop pulsating heat pipe

Cited by 79 publications

References 20 publications

Nonlinear Analysis of Chaotic Flow in a Three-Dimensional Closed-Loop Pulsating Heat Pipe

Nonlinear Analysis of Chaotic Flow in a Three-Dimensional Closed-Loop Pulsating Heat Pipe

Analysis of chaotic flow in a 2D multi-turn closed-loop pulsating heat pipe

Opportunities, challenges, and state of the art of flexible heat‐pipe heat exchangers: A comprehensive review

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