Accession Number:

AD0258750

Title:

STABILITY AND TRANSITION OF THE FREE-CONVECTION LAYER ALONG A VERTICAL FLAT PLATE

Descriptive Note:

Corporate Author:

MARYLAND UNIV COLLEGE PARK INST FOR FLUID DYNAMICS AND APPLIED MATHEMATICS

Personal Author(s):

• Szewczyk, Albin A.

Report Date:

1961-05-01

Pagination or Media Count:

91.0

Abstract:

DESCRIPTORS Soldering fluxes, Test methods, Sampling, Specifications, Corrosion, Additives, Detection. To establish the necessity of including flux from cored solders in qualification inspections, activated and nonactivated liquid external fluxes and cored solders containing fluxes of the same composition were studied. An effective method for removing flux from the cored solder, the condensation-extraction method, proved effective. Flux extracts from cored solders and equivalent liquid external fluxes were subjected to test methods of the Materials and Perform-ANCE CATEGORIES IN Spec MIL-F-14256b. Evaluation of the results showed that flux extracts performed in the same manner as the liquid external flux in all but 3 test methods 1 acid number 2 dryness and 3 resistivity of water extract. A substitute for the complicated vacuumdeposited-copper corrosion test using electroplated Cu on ferrotype panels was found. Methods for detecting the presence of the flux additives, metallic salts and maleic anhydride, were established.

Descriptors:

• *BOUNDARY LAYER
• *FLUID FLOW
• STABILITY
• EXPERIMENTAL DATA
• VORTICES
• PARTIAL DIFFERENTIAL EQUATIONS
• FLAT PLATE MODELS
• LAMINAR BOUNDARY LAYER
• PERTURBATION THEORY
• DIFFERENTIAL EQUATIONS
• SHEETS
• TURBULENCE
• LIQUIDS

Subject Categories:

• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE