Thermal analysis and numerical simulation of Pulley-Belt driven type NiTiNOL heat engine

Autor: T. Rajesh Kumar Dora, Nagaraju Dora, Gaurav Srinivas, Rohit Mazumdar
Rok vydání: 2021
Předmět:
Zdroj: Thermal Science and Engineering Progress. 21:100757
ISSN: 2451-9049
DOI: 10.1016/j.tsep.2020.100757
Popis: The NiTiNOL heat engine, belongs to the unique category of a non-conventional type of mechanically-driven engine, where the work done by an engine depends on the phase transformation that is taking place within the material by absorbing heat. The present investigation is about the experimental and numerical analysis of a NiTiNOL heat engine, where the experimental part includes the temperature monitoring of both the Ni-Ti wire and the working fluid using non-contact type and contact type sensors, respectively. But, the numerical part includes the thermal simulation of the entire physical system using ANSYS-FLUENT 15.0 Software Package. The objective of this study is to correlate the variation in temperature of Ni-Ti wire with the performance (cycle efficiency) of the NiTiNOL heat engine. It was found that the temperature-dependent material property that is affected by the martensite volume fraction (ζ) during the phase transformation (M → A), plays an important role in controlling the cycle efficiency of the heat engine. The measured values of Ni-Ti wire temperature, at specified locations using a non-contact type thermal sensor, are found to be well supported with the numerical simulation results. The time taken to reach the steady state temperature of the Ni-Ti wire during the working cycle of the engine was found to be varying in nature due to the initial temperature of the working fluid. The cycle efficiency of the engine has increased from 27% to 31%, and the thermal efficiency of the engine decreased from 70% to 50% with the time elapsed.
Databáze: OpenAIRE
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