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    • Numerical study for production of space charge within the stratiform cloud

      A K Srivastava S N Tripathi

      Volume 119 Issue 5 October 2010 pp 627-638

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jess/119/05/0627-0638

    • Keywords

       

      Stratiform cloud; space charge; electric field; attachment coefficient.

    • Abstract

       

      One dimensional numerical model has been developed to predict the production of space charge and variations in other electrical parameters within the low level stratiform type of cloud having very weak vertical motion.Non-linear coupled differential equations which govern ion concentrations,charged and neutral droplet concentrations and electric field were used.Symmetry has been observed in all the electrical parameters within the cloud.The magnitude of average positive ion concentrations was observed to be high as compared to the negative ion concentrations,which is due to low scavenging rate of positive ions than the negative ions,highly attributed to their mobilities.The rate of scavenging of ions affects the concentration of charged droplets,which eventually influence the electric field and thus the space charge density within the cloud.Maximum electric field (𝐸_max) was observed at middle of the cloud whereas minimum was observed at both the edges of the cloud.Minimum electric field (𝐸_min) was found to be equal and constant (∼27Vm−1)for any drop concentration.Net positive and negative space charges were observed at the top and bottom of the cloud,respectively.The simulated results show some discrepancies to the natural condition, which are due to simulations made under some basic assumptions and limitations and that will be incorporated in the future studies for natural cloud condition.

    • Author Affiliations

       

      A K Srivastava1 2 S N Tripathi1

      1. Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur 280 016, India.
      2. Current address: Indian Institute of Tropical Meteorology (Branch), Prof Ramnath Vij Marg, New Delhi, India.

    • Dates

       
      Published
      October 2010
      Manuscript received
      15 December 2009
      Manuscript revised
      8 April 2010
      Accepted
      1 July 2010

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