Accession Number : ADA282209

Title :   Laws of Infrared Similitude.

Descriptive Note : Final rept.,

Corporate Author : NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD

Personal Author(s) : Cervenka, Peter O. ; Massa, Lou

Report Date : JAN 1994

Pagination or Media Count : 29

Abstract : Accurate physical scale models of complex systems are found to be of great use in fields as diverse as aerodynamics, fluid mechanics, radar, or nuclear physics. It now appears that the concept of scale modeling may offer distinct advantages to those interested in the study of thermodynamic processes that occur in large physical structures. In this investigation, it is shown from a study of the heat equation and its boundary conditions that physical scale modeling can be used to simulate realistic systems operating in realistic outdoor environments. The thermal properties of the construction materials used in the system under study are allowed to vary with position, thus allowing the structure to be divided into a number of compartments. Physical effects which involve heat exchange between the structure and the ocean, or with the atmosphere, are investigated. Both time-dependent and time-independent cases are examined. Dimensionless variables, Infrared engineering, Infrared scaling laws, Scale model testing, Thermal physics.

Descriptors :   *INFRARED RADIATION, *THERMAL RADIATION, AERODYNAMICS, ATMOSPHERES, BOUNDARIES, COMPARTMENTS, CONSTRUCTION MATERIALS, ENGINEERING, ENVIRONMENTS, EXCHANGE, FLUID MECHANICS, HEAT, MATERIALS, MODELS, NUCLEAR PHYSICS, NUMBERS, OCEANS, OUTDOOR, PARTIAL DIFFERENTIAL EQUATIONS, RADAR, SCALE MODELS, STRUCTURES, THERMAL PROPERTIES, THERMODYNAMICS, TIME, VARIABLES.

Subject Categories : Optics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE