Accession Number : ADA119730

Title :   Moving Boundary Isothermal Fog Chamber (MOBIFOC).

Descriptive Note : Master's thesis,


Personal Author(s) : Fisher,George Frederick

PDF Url : ADA119730

Report Date : May 1982

Pagination or Media Count : 120

Abstract : A new instrument for the study of fog and haze is introduced. The moving Boundary Isothermal Fog Chamber is the first successful attempt to improve upon the operating ranges and reliability of these instruments since they were first introduced 10 years ago. This new concept utilizes moving sidewalls in a rectangular chamber of 2 x 20 x 58 cm and is capable of providing growth times far exceeding those in current instruments. The larger walls of the chamber (20 x 58 cm) are constructed of vulcanized rubber belts covered with a moisture absorbent material (Pellon) which are continually driven by a variable speed motor. The direction of flow is upward against gravity. The result of the marriage of moving sidewalls and upward flow is a nearly plug type flow capable of sustaining large haze droplets for an almost indefinite period of time. The advantages of this unique and innovative instrument are numerous, the least of which is the improvement in growth times over current instruments. The ability to suspend droplets and to directly observe them allow for the study of interaction of various aerosols, chemical processes and studies of visibilities in haze. The chamber has also been designed for later application of thermal gradients and, therefore, for use as a thermal gradient diffusion cloud chamber (TGDCC) which will also have extended growth times over current TGDCC's.

Descriptors :   *Fog, *Haze, *Chambers, Aerosols, Water vapor, Interactions, Troposphere, Simulators, Boundaries, Motion, Calibration, Drops, Growth(General), Electrolytes, Theses

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE