Effect of inclination during condensation inside a square cross section minichannel

Col, Davide Del; Bortolato, Matteo; Azzolin, Marco; Bortolin, Stefano

doi:10.1016/j.ijheatmasstransfer.2014.06.078

Cited by 51 publications

(11 citation statements)

References 23 publications

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“…Da Riva and co-workers (Da Riva and Del Col, 2009Da Riva et al, 2010aDel Col et al, 2014) conducted a series of extensive numerical studies on annular flow condensation of R134a in a 1 mm inner diameter horizontal minichannel. In all of their studies, they adopted a steady threedimensional VOF model to analyse the influence of gravity, turbulence and surface tension on the flow.…”

Section: Experimental and Modelling Studies In Simplified Geometriesmentioning

confidence: 99%

Thermal Energy Processes in Direct Steam Generation Solar Systems: Boiling, Condensation and Energy Storage – A Review

et al. 2019

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Section: Experimental and Modelling Studies In Simplified Geometriesmentioning

confidence: 99%

Thermal Energy Processes in Direct Steam Generation Solar Systems: Boiling, Condensation and Energy Storage – A Review

et al. 2019

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“…3, де значення коефіцієнтів тепловіддачі майже однакові за низьких значень масових швидкостей G, які становлять -50, 100 і 150 кг/(м 2 с). Автори [4] посилаються на роботи [7], [12], у яких також зауважено, що значення коефіцієнтів тепловіддачі є фактично рівними за низьких масових швидкостей G = 100 і G = 200 кг/(м 2 с).…”

Section: рисунок 2 -залежність коефіцієнтів тепловіддачі unclassified

Теплообмін При Конденсації Всередині Мініканалів

Горін¹

2017

ХТТ

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У роботі проведено аналіз експериментальних досліджень конденсації робочих речовин всередині мініканалів із літературних джерел. Наведено залежності коефіцієнтів тепловіддачі від масового паровмісту за різними масовими швидкостями та тепловими потоками. Показано вплив на тепловіддачу геометричних форм та розмірів мініканалів.

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“… 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. Del Col et al 21 Experimental and analytical Square channel with 1.23 mm hydraulic diameter R134a, R32 Horizontal, vertical and inclined (downflow and upflow) T sat = 40 °C G = 100–390 kg m −2 s −1 x = 0.2–0.9 HTC measurements Whatever the fluid, the effect of the channel inclination on the condensation HTC becomes noteworthy in downflow, at x < 0.6 and mass velocities lower than a critical value ( G crit = 150 kg m −2 s −1 for R134a, G crit = 200 kg m −2 s −1 for R32). By applying the Buckingham theorem, a criterion is developed to predict the mass velocity at which the channel inclination starts to affect FWC.…”

Section: Introductionmentioning

confidence: 99%

“…Such methods are highly instrumental in the design of thermal management systems in aircraft and spacecraft avionics. Among them, Del Col et al 21 developed a dimensionless correlation for predicting the critical mass velocity at which the effect of inclination starts to appear during condensation inside tubes. The dimensionless inclination parameter Y* (Eq.…”

Section: Introductionmentioning

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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Effect of inclination during condensation inside a square cross section minichannel

Cited by 51 publications

References 23 publications

Thermal Energy Processes in Direct Steam Generation Solar Systems: Boiling, Condensation and Energy Storage – A Review

Thermal Energy Processes in Direct Steam Generation Solar Systems: Boiling, Condensation and Energy Storage – A Review

Теплообмін При Конденсації Всередині Мініканалів

Condensation heat transfer in microgravity conditions

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