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Paper Information

Journal:   AMIRKABIR   SPRING 2003 , Volume 14 , Number 54-B; Page(s) 414 To 423.
 
Paper: 

INVESTIGATION OF EFFECT OF INCLINATION ANGLE ON THE TRANSPORT BEHAVIOUR OF A TWO-PHASE THERMOSSYPHON

 
 
Author(s):  GHOLAMI M.M.*
 
* Department of Mechanical Engineering, University of Tarbiat Modarres
 
Abstract: 

A two-phase closed thermosyphon is a gravity assisted wickless heat pipe. The condenser section is located above the evaporator, so that condensat is returned by gravity. In this project a two phase closed thermosyphon was designed and manufactured. An experimental investigation was performed in order to observe the effect of the inclination angle on the transport behaviour of a closed thermosyphon was performed in order to observe the effect of the inclination angle on the was used; this was electrically heated at the lower part ("heating zone") and it was cooled by air along the upper part ("cooling zone"). Between these two aneas there was the well insulated "Transport zone". As working fluid water was used the heating zone was always flooded. The electric heat input and the inclination angle F toward the vertical position were varied in steps. The maximum heat flow rate in the tube proved tobe dependent upon the inclination. With a largest value of Qmax=23w at 70-90 degree. An effective thermal conductivity keff of the thermosyphon can be determined depending strongly on inclination and heat flow rate so the steeper the tube value the larger the heat flow rate the higher is the effective conductivity. The condensations in the cooling zone exhibits the largest transport resistance. The heat transfer with boiling in the heating zone shows large local differences which depends on inclination.

 
Keyword(s): CLOSED TWO-PHASE THERMOSYPHON, MAXIMUM HEAT FLOW RATE, BOILING HEAT TRANSFER, CONDENSATION HEAT TRANSFER INCLINATION EFFECTS
 
References: 
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