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oai:www.ideals.illinois.edu:2142/71673 2023-07-11 col_2142_5131 col_2142_46414 com_2142_5130 com_2142_178 com_2142_234

text Applied Mechanics Studies in Unsteady Penetrative Thermal Convection Kumar, Ranganathan 2014-12-16T19:12:29Z 2014-12-16T19:12:29Z 10000-01-01 1983 1983 This study concentrates on the dynamics and structure of turbulence in the interfacial region and the upper part of a mixed layer which is capped by a linearly stratified, non-turbulent region. Measurements of the local, instantaneous values of the temperature, the vertical velocity and horizontal velocity have been made using a thermocouple and a two-component dual beam laser Doppler velocimeter. Vertical profiles of all relevant one-point moment including joint temperature-velocity moments up to fourth order have been obtained. Mean temperature measurements have been made for various kinematic heat flux settings to understand the thermal structure in the entrainment zone. Conditional averaging techniques and probability density functions have been employed to infer the properties of fluid elements in the mixed layer. A length scale in the interfacial layer, based on the temperature gradient in the stable region has been proposed. Power spectra for velocity and temperature have been analyzed to check the possible existence of inertial subrange and estimate the noise level. With the aid of flow visualization, a phenomenological model of penetrative convection for low entrainment rate has been developed. Made available in DSpace on 2014-12-16T19:12:29Z (GMT). No. of bitstreams: 1 8324590.pdf: 4128470 bytes, checksum: df63910a46aaa17a36ec5ab6e9b82b9f (MD5) Previous issue date: 1983 Embargo set by: Seth Robbins for item 71839 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 165 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1983. http://hdl.handle.net/2142/71673 (UMI)AAI8324590 Theoretical and Applied Mechanics Theoretical and Applied Mechanics University of Illinois at Urbana-Champaign Dissertation Ph.D.