The quantity of precipitation received by the monsoons is enormous. The south-west monsoons, unlike the north-east monsoons, have been studied in great detail. This study deals with rainwater collection during the NE monsoons and involves an examination of the stochastic nature of a turbulent boundary layer and the effect of crosswinds on rain droplet trajectories and thence their collection. It must be borne in mind that whilst mid latitude precipitations typically range from a few millimetres per hour, the north-east monsoon showers experience rainfall rates often 10 times higher than this value and their calculations deserve special attention. Probability distribution functions are calculated to quantify the coordinates of the landing trajectories on rooftop collectors. This investigation was essential to emulate the prevalent conditions of intense driving rain on top of high rises where setting up of a collector will be most suitable to directly harness rainwater in its purest form before contamination. © 2012 CIWEM.

Satyajit Ghosh

Department of Thermal and Energy Engineering

School of Mechanical Engineering

Vellore Campus

Damala V.T

Veluchamy B.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Water and Environment Journal

Air pollution can affect cloud formation in more than one way. When the pollutant gases are condensable (e.g. oxides of sulphur), then the process of aerosol activation is eased to a certain extent aiding cloud formation. However, polluted days are often characterised by low updraught speeds which inhibit aerosol growth. In this study, we have critically examined the aerosol activation process in a polluted coastal environment where both effects are present. We have concentrated on the Chennai region (one of the largest cities in the world) of the Indian sub-continent because its pace of industrialisation is increasing rapidly, adding to increasing SO2 pollution over the years. Air masses over Chennai contain a mixture of aerosol particles including NaCl, because of its proximity to the Bay of Bengal, along with ammonium sulphate. We have used observational data along with a detailed microphysical chemical parcel model to study cloud activation effects. We find that over Chennai, often the presence of the condensable pollutant vapour (SO2) more than compensates for the low updraught speeds by lowering the level of maximum super saturation significantly. This latter effect favours the activation of ammonium sulphate as well as NaCl aerosol particles. We have undertaken a systematic analysis to quantify the relative strengths of these two competing effects and find that even with low updraught speeds, oxides of sulphur can perturb the activation domain comprising a mixture of aerosol particles to such an extent that aerosol particles in polluted environments often grow efficiently. This effect is non-intuitive in the sense that one associates smaller cloud droplet sizes with polluted air masses. This is the first microphysical modelling study for the Indian sub-continent where National Environmental Engineering Research Institute (NEERI) observations have been applied to cloud microphysical processes. Copyright © 2009 Royal Meteorological Society.

Fulltext

Atmospheric Science Letters

Aerosol growth and activation in polluted air masses over a tropical metropolis in the Indian sub-continent

Advances in Geosciences

Wet scavenging of SO&lt;sub&gt;2&lt;/sub&gt; emissions around India's largest lignite based power plant

Atomization and Sprays

SPLASHING PHENOMENA DURING LIQUID DROPLET IMPACT

Science

Increasing Trend of Extreme Rain Events Over India in a Warming Environment

Annales Geophysicae

On the application of the classic Kessler and Berry schemes in Large Eddy Simulation models with a particular emphasis on cloud autoconversion, the onset time of precipitation and droplet evaporation

Optimizing rainwater collection from droplets falling through crosswinds during the north-east monsoons

Journal	Data powered by TypesetWater and Environment Journal
Publisher	Data powered by TypesetWiley
ISSN	1747-6585
Open Access	0