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I. The transient boundary layer produced by a sink on a plane wall. II. Flow of dusty gases


Parthasarathy, Shakkottai P. (1969) I. The transient boundary layer produced by a sink on a plane wall. II. Flow of dusty gases. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/GAFK-2R04.


Part I: The solution for the problem of the transient boundary layers generated by a sink on a plane wall is obtained by an integral method. The incompressible flow is similar and the similarity solutions are obtained for the two dimensional and axisymmetric cases. The velocity layer reaches a steady state and the thermal layer does not. For large times, when the thermal layer is much thicker than the velocity layer, a solution for the temperature field is obtained ignoring the velocity layer. With some approximations to the flow near the sink, similar solutions for compressible flow are also obtained.

Part IIa: By using the integrated equations of motion, the development of a laminar, two-dimensional, dusty jet issuing from a slit is considered. The solutions are simple in the limits τ → 0 and τ → ∞, where τ is the particle relaxation time. For arbitrary τ, a numerical example is given. With some assumptions, the turbulent dusty jet is also considered.

Part IIb: There are three parameters in the problem of steady motion of a dusty gas around a sphere. These are the Reynolds number R, particle parameter σ and the mass concentration of dust f[subscript ∞]. Solutions are obtained by the perturbation method by expanding in terms of R with σ or σ/R fixed, in the limit R → 0. Solutions are also obtained for the limit R tending to infinity with f < < 1. In both cases critical values of σ exist, below which the sphere does not capture dust. The efficiency of capture as a function of σ is calculated in both cases.

Item Type:Thesis (Dissertation (Ph.D.))
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Aeronautics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Saffman, Philip G.
Thesis Committee:
  • Saffman, Philip G. (chair)
  • Sturtevant, Bradford
  • Liepmann, Hans Wolfgang
Defense Date:26 May 1969
Record Number:CaltechETD:etd-04012009-085458
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1243
Deposited By: Imported from ETD-db
Deposited On:02 Apr 2009
Last Modified:21 Dec 2019 02:06

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