Accession Number : ADA202714


Title :   Corona Wind Cooling Comparisons for Horizontal Cylinders


Descriptive Note : Master's thesis


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING


Personal Author(s) : Hodge, Pamela R


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a202714.pdf


Report Date : Sep 1988


Pagination or Media Count : 134


Abstract : Corona wind 'refers to the movement of gas induced by the repulsion of ions from the vicinity of high voltage discharge electrode'. A typical corona test configuration (13:4) is illustrated in Figure 1. Free charges are produced in the ionized region surrounding the high field active electrode. These charged particles migrate and collide with neutral air particles in the drift. Experiments were conducted to determine the effect of the corona wind on the convective heat transfer rate form each of three horizontally mounted, heated aluminum cylinders. The cylinder was maintained at ground potential and an emitter was connected to a high voltage source. Stretched wire and multipoint emitter devices were used. Emitter-to-cylinder spacing and field voltage were parameters. Blown air was also used to simulate the corona wind generated from the stretched wire emitter. An energy balance method was used for data analysis. Free convection heat transfer rates were used as a baseline. The results of all experiments were compared and contrasted. The multipoint emitter was a more efficient emitter device than the stretched wire emitter. The convection heat transfer rate due to the corona wind with an applied high voltage field of 15kV was as much as 6.5 times the free convection heat transfer rate. Keywords: Electrostatic cooling. Theses.


Descriptors :   *IONIZATION , *ELECTROSTATICS , *CHARGED PARTICLES , IONS , SOURCES , AIR , NEUTRAL , ENERGY , WIND , RATES , EFFICIENCY , THESES , VOLTAGE , COOLING , REGIONS , DRIFT , PARTICLES , CYLINDRICAL BODIES , ELECTRODES , CONFIGURATIONS , BALANCE , HORIZONTAL ORIENTATION , CONVECTION(HEAT TRANSFER) , EMITTERS , HIGH VOLTAGE , GROUND LEVEL , ELECTRICAL CORONA , TEST AND EVALUATION , DATA PROCESSING


Subject Categories : Electricity and Magnetism


Distribution Statement : APPROVED FOR PUBLIC RELEASE