A study on the mechanism of dropwise condensation. 1st report Measurement of heat-transfer coefficient of steam at low pressures.

重雄, 幡宮; 宏明, 田中

doi:10.1299/kikaib.52.1828

Cited by 9 publications

(4 citation statements)

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“…Measurements, in general agreement with each other, have been made by several investigators (Tanner et al (1968), Graham (1969), Wilmshurst and Rose (1970), Stylianou and Rose (1980), Tsuruta and Tanaka (1983) and Hatamiya and Tanaka (1986)) for dropwise condensation of steam at pressures ranging from atmospheric down to around 1 kPa. A typical dataset is shown in Fig.…”

Section: -supporting

confidence: 73%

Dropwise condensation theory and experiment: A review

Rose

2002

Proceedings of the Institution of Mechanical Engineers, Part A:

610

412

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The paper reviews progress in dropwise condensation research from 1930 to the present. Particular attention is given to heat transfer measurements, theory, transition and effects of surface material. Although it has been known since the 1930s that heat transfer coefficients for dropwise condensation of steam are much higher than those for film condensation, there were, until the 1960s, wide discrepancies between the results of different investigators. Subsequently, more accurate measurements have shown good consistency and the mechanism and theory of the dropwise condensation have become better understood. There has been considerable controversy over the magnitude of the so-called ‘constriction resistance’ and the effect of the surface thermal conductivity on the heat transfer coefficient. The balance of evidence suggests that this is only significant at very low heat fluxes and for very small condensing surfaces. Measurements have also been made with sufficiently high cooling intensities to cover the range of dropwise to filmwise condensation transition. The detailed mechanism of transition is still not fully understood. Perhaps most importantly, the practical problem of promoting lasting dropwise condensation under industrial conditions remains to be solved despite considerable effort spanning more than 70 years.

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Section: -supporting

confidence: 73%

Dropwise condensation theory and experiment: A review

Rose

2002

Proceedings of the Institution of Mechanical Engineers, Part A:

610

412

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“…Accurate surface temperature and heat flux measurements are best achieved using flat plate geometries where heat flux and surface temperature can be accurately determined from slope and intercept of temperature distributions in the condenser plate. This geometry is recommended for fundamental condensation measurements and results should be benchmarked against well-documented data sets [30][31][32][33][34][35][36]. A set of repeatable data showing the dependence of heat flux on pressure and temperature and comparison with theory is given in Figure 1.…”

Section: Classic Dropwise Condensation Theory and Experimentsmentioning

confidence: 99%

Dropwise Condensation on Micro- and Nanostructured Surfaces

Enright¹,

Miljkovic

Alvarado

et al. 2014

Nanoscale and Microscale Thermophysical Engineering

245

186

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In this review we cover recent developments in the area of surface-enhanced dropwise condensation against the background of earlier work. The development of fabrication techniques to create surface structures at the micro-and nanoscale using both bottom-up and top-down approaches has led to increased study of complex interfacial phenomena. In the heat transfer community, researchers have been extensively exploring the use of advanced surface structuring techniques to enhance phase-change heat transfer processes. In particular, the field of vapor-to-liquid condensation and especially that of water

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“…Schmidt et al [9] first recognized 5-7 times higher heat transfer coefficients in dropwise condensation rather than filmwise condensation. Subsequent research investigated many parameters impacting dropwise condensation, including nucleation mechanisms [10], nucleation density [11][12][13], subcooling degree [14], droplet size [14][15][16], surface structures [17,18], channel geometry [19], steam velocity [8,20], heat flux [20], and saturation pressure [16,21]. Lee et al [13] numerically studied dropwise condensation on a nanopin-structured surface on which nucleation density was tunable by changing nano-pin dimensions and spacing.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

“…Immediately after the surface was cleared, extremely high transient heat transfer coefficients (greater than 1 MW/m 2 k) were measured. Hatamiya and Hiroaki [21] experimentally studied dropwise condensation of steam on a variety of surfaces (e.g., gold-plated copper, ultrafinished gold disk, gold-vapor deposited silicon disk, and chromium plated copper) at different saturation pressures. Under the same conditions, smaller droplets seemed to be more densely populated on the gold-plated surface and provided higher heat transfer coefficients.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%