Accession Number : AD0784204

Title :   An Investigation of a Remote Transient Heat Flux Sensor. Part II. Error Analysis.

Descriptive Note : Final rept. 1 Jan-15 Aug 74,

Corporate Author : IOWA INST OF HYDRAULIC RESEARCH IOWA CITY

Personal Author(s) : Chen,Ching Jen ; Danh,Truong Minh

Report Date : AUG 1974

Pagination or Media Count : 93

Abstract : The second part of the report is error analysis of a remote heat flux sensor. The Chromel Alumel thermocouple measurement in a finite rectangular slab exposed to a constant heat flux is analyzed for error due to distortion of temperature by cavities drilled. In the experiment three test pieces 1 in., 3/4 in., and 1/2 in. thick of steel plates initially at the room temperature are exposed to a heat flux of 1700 Btu/ft sq. hr. Error in the response of temperature due to disturbance by the cavities of 1/16 in., 1/8 in., 1/4 in., and 1/2 in. hole diameter at four different depths are determined. It is found that error ranging 8 to 18% and is more sensitive to the hole diameter than the variation in depth between 20 to 80% of the plate thickness. Guideline for correction of the temperature response measured by an intrinsic thermocouple is then established before the inversion of the data for prediction of the transient surface and heat flux is made. (Author)

Descriptors :   *Remote detectors, *Heat flux, *Gun barrels, Thermocouples, Errors, Thermal conductivity, Surface temperature, Transients, Response, Computer programs

Subject Categories : Test Facilities, Equipment and Methods
      Guns

Distribution Statement : APPROVED FOR PUBLIC RELEASE