NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Interfacial force field characterization of a constrained vapor bubble thermosyphon using IAIThe isothermal profiles of the extended meniscus in a quartz cuvette were measured in a gravitational field using IAI (image analyzing interferometer) which is based on computer enhanced video microscopy of the naturally occurring interference fringes. The experimental results for heptane and pentane menisci were analyzed using the extended Young-Laplace Equation. These isothermal results characterized the interfacial force field in-situ at the start of the heat transfer experiments by quantifying the dispersion constant for the specific liquid-solid system. The experimentally obtained values of the disjoining pressures and the dispersion constants are compared to the subsequent non-isothermal experiments because one of the major variables in the heat sink capability of the CVBT is the dispersion constant. In all previous studies of micro heat pipes the value of the dispersion constant has been 'guesstimated'. The major advantages of the current glass cell is the ability to view the extended meniscus at all times. Experimentally, we find that the extended Young-Laplace Equation is an excellent model for for the force field at the solid-liquid vapor interfaces.
Document ID
19950008146
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Dasgupta, Sunando
(Rensselaer Polytechnic Inst. Troy, NY, United States)
Plawsky, Joel L.
(Rensselaer Polytechnic Inst. Troy, NY, United States)
Wayner, Peter C., Jr.
(Rensselaer Polytechnic Inst. Troy, NY, United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1994
Publication Information
Publication: NASA. Lewis Research Center, Second Microgravity Fluid Physics Conference
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
95N14560
Funding Number(s)
CONTRACT_GRANT: NAG3-1399
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
No Preview Available