Analytical Investigation into Effects of Capillary Force on Condensate Film Flowing over Horizontal Semicircular Tube in Porous Medium

Chang, Tong‐Bou; Shiue, Bai-Heng; Ciou, Yi-Bin; Lo, W.

doi:10.1155/2021/6693512

Cited by 2 publications

(1 citation statement)

References 27 publications

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“… Investigators Type of study Geometry Fluids Working conditions Activities performed Main results Azzolin et al 64 Experimental and analytical Circular 3.38 mm ID channel R134a Horizontal and vertical downflow T sat = 40 °C Δ T sat-wall = 3.1–17.1 K G = 50–200 kg m −2 s −1 HTC measurements Flow visualizations The HTC in vertical downflow can be as low as half the value in horizontal flow at the same operating conditions. Chang et al 91 Analytical Semi-circular tube with 0.2 m diameter Saturated steam Horizontal Δ T sat-wall = 5–25 K Analytical study on laminar FWC over a horizontal semi-circular tube If the capillary force is greater than the gravity force, the condensate is sucked into the two-phase zone leading to lower liquid film thickness and higher HTC. Da Riva and Del Col 31 Numerical Circular 1 mm ID minichannel R134a Horizontal and vertical downflow T sat = 40 °C T wall = 30 °C G = 100, 800 kg m −2 s −1 x = 0.4–1 Numerical simulations of FWC inside a circular channel by means of VOF method At G = 100 kg m −2 s −1 , HTCs obtained in the horizontal configuration nearly doubles the one in vertical downflow due to stratification effects.…”

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confidence: 99%

Condensation heat transfer in microgravity conditions

et al. 2023

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In the present paper, a thorough review of the experimental and numerical studies dealing with filmwise and dropwise condensation under microgravity is reported, covering mechanisms both inside tubes and on plain or enhanced surfaces. The gravity effect on the condensation heat transfer is examined considering the results of studies conducted both in terrestrial environment and in the absence of gravity. From the literature, it can be inferred that the influence of gravity on the condensation heat transfer inside tubes can be limited by increasing the mass flux of the operating fluid and, at equal mass flux, by decreasing the channel diameter. There are flow conditions at which gravity does exert a negligible effect during in-tube condensation: predictive tools for identifying such conditions and for the evaluation of the condensation heat transfer coefficient are also discussed. With regard to dropwise condensation, if liquid removal depends on gravity, this prevents its application in low gravity space systems. Alternatively, droplets can be removed by the high vapor velocity or by passive techniques based on the use of condensing surfaces with wettability gradients or micrometric/nanometric structuration: these represent an interesting solution for exploiting the benefits of dropwise condensation in terms of heat transfer enhancement and equipment compactness in microgravitational environments. The experimental investigation of the condensation heat transfer for long durations in steady-state zero-gravity conditions, such as inside the International Space Station, may compensate the substantial lack of repeatable experimental data and allow the development of reliable design tools for space applications.

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