Accession Number:

ADA261050

Title:

Thermocapillary Flow Near a Cold Wall

Descriptive Note:

Technical rept., Jan-Dec 1992

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

Report Date:

1993-01-20

Pagination or Media Count:

44.0

Abstract:

The following model problem examines the thermocapillary feedback mechanism important at the edge of weld pools and other materials processes. A pool of liquid with a flat horizontal free surface is bounded on one side by a vertical solid wall, which is maintained at a cold temperature to unit depth, and at a warmer temperature below far away the fluid is at the warmer temperature. Surface tension is a decreasing function of temperature, so that the surface thermal gradient drives flow toward the corner. When convection is vigorous, the flow compresses the thermal gradient which is driving the flow this positive feedback results in small local length scales and high velocities near the corner. This problem is examined through a detailed scaling analysis and through numerical simulation for a range of parameters.... Thermocapillary flow.

Subject Categories:

  • Fabrication Metallurgy
  • Fluid Mechanics
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE