Paper Information

Journal:   MODARES MECHANICAL ENGINEERING   JULY 2017 , Volume 17 , Number 4 #P0099; Page(s) 85 To 91.
 
Paper: 

A NUMERICAL INVESTIGATION OF NUSSELT NUMBER AND FRICTION COEFFICIENT IN AN ARC-TYPE STIRLING ENGINE HEATER

 
 
Author(s):  FARZI HASSAN, KESHAVARZ VALIAN ALI*, BATOOEI ALIREZA
 
* DEPARTMENT OF MECHANICAL ENGINEERING, KHAJE NASIR TOOSI UNIVERSITY OF TECHNOLOGY, TEHRAN, IRAN
 
Abstract: 

The usages of Stirling engine in many industries such as aerospace, submarines and combined heat and power systems, requires more and detailed analysis in such engines. This type of engine is an external combustion which may use almost any type of fuel. In this article the Nusselt number and friction coefficient of a Stirling engine heat exchanger is investigated numerically. The geometry of this heat exchanger is an arc shape pipe with reciprocating flow. Various parameters such as angular frequencies, type of fluids, working gas pressures, flow regime and heater geometry impact on the Nusselt number and friction coefficient of the heater were investigated. By increasing the angular frequency and the working gas pressure the Nusselt number increases but the friction coefficient decreases. The influences of different working fluids indicated that carbon dioxide has the highest Nusselt number. The results also show that the friction coefficient is highly dependent on the flow regime. Comparison between the two different geometry type heaters shows that the arc-type geometry led to higher Nusselt number. The friction coefficients of both geometries are almost similar to each other at high frequencies.

 
Keyword(s): STIRLING ENGINE, RECIPROCATING FLOW, NUSSELT NUMBER, FRICTION COEFFICIENT, NUMERICAL SOLUTION
 
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