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Heat Pipe Science and Technology, An International Journal

ISSN Print: 2151-7975
ISSN Online: 2151-7991

Archives: Volume 1, 2010 to Volume 8, 2017

Heat Pipe Science and Technology, An International Journal

DOI: 10.1615/HeatPipeScieTech.v5.i1-4.160
pages 169-176

EXPERIMENTAL ANALYSIS OF THE INSTABILITIES EFFECT ON THE THERMAL PERFORMANCE OF A CLOSED LOOP TWO-PHASE THERMOSYPHON

Sauro Filippeschi
Department of Energy, Systems, Land and Construction Engineering, University of Pisa, Italy
Alessandro Franco
University of Pisa − DESTEC, Largo L. Lazzarino 2, Pisa 56122, Italy

ABSTRACT

This paper deals with the experimental analysis of a Closed Loop Two-Phase Thermosyphon of small size (vertical height lower than 2 m) and low input power (lower than 1 kW). As reported in the literature the thermal performance are affected by parameters as: filling ratio, working fluid, tube diameter, vertical size and input power. These parameters influence the mass flow rate which naturally circulates inside the loop. The authors have designed and realized an experimental CLTPT to experimentally analyze the circulating mass flow rate in connection with the thermal performances. The test rig consists of an evaporator realized with a glass pipe of 10 mm of internal diameter and a water cooled horizontal condenser. This apparatus allows the mass flow rate to be measured by means an integral measurement. The mass circulation shows an unstable periodic behavior a different two-phase flow pattern map at different heat load. The visualization of the flow patterns made with a high speed videocamera allows the measurement of the transient vapor quality and the frequency of the periodic flow. The heat and mass transfer is analyzed in dependence of the different variables: heat input (0-1000 W), filling ratio and subcooling rate.


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