Dew and rain water collection in the Dalmatian Coast, Croatia

Muselli, Marc; Beysens, Daniel; Mileta, Marina; Milimouk, I.

doi:10.1016/j.atmosres.2009.01.004

Cited by 83 publications

(85 citation statements)

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“…[2][3][4] An example of the recent breakthroughs allowed by a deeper understanding and control of the coalescence of droplets is the development of improved coatings for dew collection. 5 In addition to the potential technological interest, the coalescence of sessile droplets is a fascinating fluid dynamical event which encompasses challenging modeling features such as a free surface and a dynamic contact line. The ability to accurately capture these features is paramount to the development of open microfluidic technologies.…”

Section: Introductionmentioning

confidence: 99%

Modeling the coalescence of sessile droplets

Sellier

Trelluyer

2009

Biomicrofluidics

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This paper proposes a simple scenario to describe the coalescence of sessile droplets. This scenario predicts a power-law growth of the bridge between the droplets. The exponent of this power law depends on the driving mechanism for the spreading of each droplet. To validate this simple idea, the coalescence is simulated numerically and a basic experiment is performed. The fluid dynamics problem is formulated in the lubrication approximation framework and the governing equations are solved in the commercial finite element software COMSOL. Although a direct comparison of the numerical results with experiment is difficult because of the sensitivity of the coalescence to the initial and operating conditions, the key features of the event are qualitatively captured by the simulation and the characteristic time scale of the dynamics recovered. The experiment consists of inducing coalescence by pumping a droplet through a substrate which grows and ultimately coalesces with another droplet resting on the substrate. The coalescence was recorded using high-speed imaging and also confirmed the power-law growth of the neck.

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Section: Introductionmentioning

confidence: 99%

Modeling the coalescence of sessile droplets

Sellier

Trelluyer

2009

Biomicrofluidics

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“…As clear nights allow greater surface cooling, they are optimum for dew formation, as opposed to cloudy nights (Kidron 2000). Muselli et al (2009) found that dew yields decreased approximately linearly with the increase of mean cloud cover, which was used as an indicator of thermal emissivity of the sky, as described by the following equation:…”

Section: Sky Emissivitymentioning

confidence: 99%

“…Dew formation is more likely to occur under clear skies. For example, studies in continental and coastal areas showed that yield was directly proportional to atmospheric transparency and sky visibility to infrared radiation (Beysens et al 2006;Muselli et al 2009).…”

Section: Sky Emissivitymentioning

confidence: 99%

“…According to the radiative energy available for condensation, the upper limit of dew yield is 0.8 L/day/m 2 (Monteith and Unsworth 1990). However, the maximum recorded yields of dew water in arid and semi-arid climates typically fall within a range of 0.3-0.6 L/day/m 2 of surface area (Muselli et al 2009;Maestre-Valero et al 2011;Lekouch et al 2012). Studies conducted in more humid climates showed lower yield; for example, in a perennial grassland environment in the Netherlands, the maximum water collected was 0.19 L/day/m 2 (Jacobs et al 2008); for a humid tropical island in French Polynesia, the maximum amount was 0.23 L/day/m 2 (Clus et al 2008); and in an agricultural environment near an urban area in SainteAnne-de-Bellevue, QC, Canada, the maximum amount was 0.37 L/day/m 2 (Khalil et al 2015).…”

Section: Introductionmentioning

confidence: 99%

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A review: dew water collection from radiative passive collectors to recent developments of active collectors

Khalil

Adamowski

Shabbir

et al. 2015

Sustain. Water Resour. Manag.

135

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Dew water is water droplets formed due to condensation of atmospheric water vapor on surfaces of temperature below its dew point temperature. Dew water can be seen as a nonconventional source of water and may be exploited in regions where weather conditions favor dew formation and inadequate supply and quality of water is a prevalent problem. There are two main types of dew condenser, the apparatus used to collect dew water, namely radiative (also called passive) and active condensers. Radiative passive collectors rely on exploiting the physical processes responsible for dew formation to collect dew water without any additional energy input. Previous studies indicate that a 1 m 2 radiative condenser yields between 0.3 and 0.6 L/day of dew water in arid and semi-arid regions. Active condensers have been designed as an alternative method of collection that produces higher yields by using additional energy inputs. Several designs of active condensers have been patented for which the yield can reach 20 L/day for portable devices, and up to 200,000 L/day for larger agricultural water devices. Active condensers are also known as atmospheric water generators, dehumidifiers, and air to water devices. Most of the active condensers are based on a regenerative desiccant that attracts and holds large volumes of water from the air or on a means of cooling the condensing surface below the dew point temperature (refrigeration circuit). The larger yields and wider range of environmental conditions in which dew can be collected make active condensers a promising option as an alternative or supplemental source of water in water scarce regions. The aim of this paper was to provide a comprehensive review of radiative and active condensers, including dew formation processes, methods of dew collection, and parameters that influence the dew collection. Subsequently, patents of active condensers were reviewed to ascertain how they can be integrated with different types of renewable energy and to assess the potential use of such integrated systems as a sustainable source of water in regions that suffer water scarcity and/or as a sustainable source of water for agriculture.

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“…Similar proposals in the theoretical considerations were presented by NILSSON, (1996) using a function of air temperature. The conducted measurements indicate that the greatest efficiency of dew formation (about 0.6 L/m 2 ) during a single dew episode was observed in the subtropical and semi-arid tropical zones in Israel, Croatia and India (BERKOWICZ et al, 2007;MUSELLI et al, 2009;LEKOUCH et al, 2010b).…”

Section: Introductionmentioning

confidence: 99%

Dew Formation and Chemistry Near a Motorway in Poland

Gałek

Sobik

Błaś

et al. 2011

Pure Appl. Geophys.

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Abstract-In this study, the influence of traffic intensity on dew formation efficiency and chemistry is presented. The measurements were conducted near the A4 motorway in SW Poland in almost flat land relief with intense agricultural activity. The dew/hoarfrost was collected by means of insulated plain passive radiative condensers at three sites: AN and AS located in the close vicinity of the motorway (30 m) on the opposite sides of the road, and AR, representing rural background conditions beyond the motorway influence. Measurements were conducted in two short campaigns in April and September 2009 with 9 and 10 collection days respectively. The average daily efficiency of dew formation was 0.179 L/ m 2 . Its value for AN, AS and AR was on average 0.170, 0.199 and 0.173 L/m 2 , respectively. The efficiency of dew formation at measurement sites located on both sides of the road differed by up to about 200% during an individual dew episode. Maximum daily value reached 0.389 L/m 2 . The average volume-weighted pH was acidic and ranged from 4.29 (AS) to 4.58 (AR). The electric conductivity (EC) at all measurement sites was relatively low reaching on average 55.9 lS/cm for AN, 62.2 lS/cm for AS and 35.8 lS/cm for AR. The average volume-weighted TIC parameter (total ionic content) reached the value of 0.62 meq/L (AN and AS) and 0.38 meq/L (AR). Both EC and TIC values indicated strong influence of the motorway at sites located in its close vicinity (AN and AS). Depending on airflow direction during individual dew collection events, AN or AS sites were situated alternatively on windward or leeward side of the road, which distinctly influenced dew formation and chemistry: the leeward condenser was characterized by smaller water volume, higher EC and higher TIC when compared both with its windward counterpart and the background site. The ionic structure of the collected samples was similar at all measurement sites. The largest share had NO 3 -anion (28-32%) and Ca 2? cation (22-25%). Thus, air pollution was relatively low in the vicinity of the A4 motorway in SW Poland not exceeding the typical values for urban background stations.

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Dew and rain water collection in the Dalmatian Coast, Croatia

Cited by 83 publications

References 12 publications

Modeling the coalescence of sessile droplets

Modeling the coalescence of sessile droplets

A review: dew water collection from radiative passive collectors to recent developments of active collectors

Dew Formation and Chemistry Near a Motorway in Poland

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