Open AccessExperimental analysis of heat transfer between a heated wire and a rarefied gas in an annular gap with high diameter ratio
Author(s) -
H. Chalabi,
O Buchina,
Luca Saraceno,
Marco Lorenzini,
Dimitris Valougeorgis,
Gian Luca Morini
Publication year - 2012
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/362/1/012028
Subject(s) - materials science , heat transfer , thermal conduction , atmospheric pressure , mechanics , shell (structure) , thermodynamics , composite material , physics , meteorology
In this paper a first experimental attempt is performed to measure heat conduction through rarefied air at rest contained between two concentric cylinders. The heat transfer between a heated platinum wire having a diameter (d) of 0.15 mm, disposed along the axis of a cylindrical shell in stainless steel having an inner diameter (D) of 100 mm, and a surrounded rarefied gas has been studied experimentally and numerically. The ratio between the outer and inner diameter of the annular region filled by the gas is large (D/d=667). In the annular region filled with air the pressure was varied by using a vacuum pump from atmospheric value down to 10-3 mbar. Temperature differences between the wire and the external stainless steel wall in the range 50-125 K were imposed and the heat power transferred from the wire to the surround was measured as a function of the gas pressure starting from air at atmospheric conditions down to 10-3 mbar. The experimental results obtained in these tests were compared with the numerical results obtained by using the linear and nonlinear Shakhov kinetic models. © Published under licence by IOP Publishing Ltd