Heat Transfer Characteristics of the Two-Phase Closed Thermosyphon (Wickless Heat Pipe)

Andros, F.; Florschuetz, L. W.

doi:10.1615/ihtc7.930

Cited by 3 publications

(3 citation statements)

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“…Under certain conditions, the breakup of the liquid film results in the formation of stable parallel rivulets separated by dry patches (figure 1), which is the basis for the present study. Such rivulets have been observed experimentally (Ponter et al 1967;Munakata et al 1975;and Andros 1980) of symmetry has been shown to equal the liquid film thickness at breakup (El-Genk & Saber 2001. The breakup of a flowing thin liquid film typically occurs when the liquid flow rate decreases below that required to maintain a continuous film on the underlying surface.…”

Section: Introductionmentioning

confidence: 92%

“…The breakup of a downflowing or a climbing thin liquid film on a vertical or an inclined surface, subject to either cocurrent or countercurrent interfacial shear or gas flow, is of interest in many industrial applications and processes (Hartely & Murgatroyd 1964;Hobler 1964;Hewitt & Lacey 1965;Ponter et al 1967;Bankoff 1971;Munakata, Watanabe & Miyashita 1975;Mikielewicz & Moszynski 1976;Andros 1980;Doniec 1991;El-Genk & Saber 2001. Examples include distillation, closed two-phase thermosyphons, wetted columns, cooling towers, thin-film heat exchangers, painting, and cooling of nuclear fuel rods following the accidental loss of coolant in a light water reactor (LWR).…”

Section: Introductionmentioning

confidence: 99%

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On the breakup of a thin liquid film subject to interfacial shear

Saber

El‐Genk

2004

J. Fluid Mech.

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The breakup of a thin non-evaporating liquid film that is either flowing down or climbing on a vertical or inclined surface and subject to cocurrent or countercurrent interfacial shear (or gas flow) is investigated analytically. Analytical expressions for the dimensionless liquid film thickness, $\Delta_{\hbox{\scriptsize\it min}}$, and wetting rate, $\Gamma_{\hbox{\scriptsize\it min}}$, at breakup are derived based on the minimization of the total energy of a stable rivulet, formed following the film breakup. For a downflowing liquid film, increasing the cocurrent interfacial shear (or gas velocity) or decreasing the equilibrium contact angle, $\theta_{o}$, decreases both $\Delta_{\hbox{\scriptsize\it min}}$ and $\Gamma _{\hbox{\scriptsize\it min}}$, below their values with zero interfacial shear. Conversely, increasing the countercurrent interfacial shear or $\theta_{o}$, increases both $\Delta_{\hbox{\scriptsize\it min}}$ and $\Gamma_{\hbox{\scriptsize\it min}}$, above their values with zero interfacial shear. The predictions of $\Delta _{\hbox{\scriptsize\it min}}$ and $\Gamma _{\hbox{\scriptsize\it min}}$ for a climbing water film on a vertical surface are in good agreement with reported experimental data for a wide range of cocurrent gas velocities.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

On the breakup of a thin liquid film subject to interfacial shear

Saber

El‐Genk

2004

J. Fluid Mech.

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“…The film breaks into rivulets that extend downstream in the flow [10,11]. The rivulets may further break into discrete water droplets [28]. The paper will perform numerical calculations on the physical processes of the continuous flow of the anti-icing surface water film mentioned above, as well as the rupture of the continuous water film leading to the formation of rivulets, the calculation in this paper includes five main parts, as shown in Figure 1.…”

Section: Physical Process and Overall Calculation Processmentioning

confidence: 99%

Numerical Simulation of Water Film Flow and Breakup on Anti-Icing Surface

Zhang,

Liu,

et al. 2024

Aerospace

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The flow and morphological characteristics of liquid water on the icing and anti-icing surfaces of aircraft are closely related to the icing characteristics and anti-icing surface temperature distribution. To predict the flow and breakup characteristics of a water film, a 3D model of continuous water film flow and a model of water film breakup into rivulets on an anti-icing surface were constructed based on the icing model, and the corresponding methods for solving the models were developed. Using the NACA0012 airfoil as a simulation object, the changing characteristics of height and velocity for a continuous water film with time and the morphological characteristics of rivulets formed from the breakup of a continuous water film were simulated numerically. The results indicate that, with an increase in inflow velocity, the time required for the water film to completely cover the surface and reach stability decreases. Downstream in the water droplet impact zone, the calculated values of continuous water film height align well with experiments, as well as the stream height at the continuous water film rupture location with the experimental values. With the reasonable contact angle, the calculation error of the stream width is within 10%.

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Heat-Transfer Analysis in Heat Sink Embedded with a Thermosyphon

Teoh

Maschmann

2003

Journal of Thermophysics and Heat Transfer

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Heat Transfer Characteristics of the Two-Phase Closed Thermosyphon (Wickless Heat Pipe)

Cited by 3 publications

References 0 publications

On the breakup of a thin liquid film subject to interfacial shear

On the breakup of a thin liquid film subject to interfacial shear

Numerical Simulation of Water Film Flow and Breakup on Anti-Icing Surface

Heat-Transfer Analysis in Heat Sink Embedded with a Thermosyphon

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