Determination of convective heat transfer coefficient in human femur bone drilling in the presence of normal saline and evaluation of effective parameters

Document Type : Research Article

Authors

1 Mechanical Engineering Group/ Department of Engineering/University of Zanjan/Zanjan/Iran

2 Mechanical Engineering Group/ Department of Engineering/ University of Zanjan/ Znajan/Iran

Abstract

This research has analyzed the drilling process in the human femur bone to determine the heat transfer coefficient and occurrence or non-occurrence of thermal necrosis. 3D drilling simulation has carried out naturally with air and force convection with normal-saline and the analysis was performed for three feed rates of 50, 100, and 150 millimeters per minute(mm/min) at speeds of 500, 1000, and 2000 rotation per minute(rpm). The results show that in natural cooling, the highest generated heat is equal to 4 Joule at 50mm/min and 500rpm while the lowest value of generated heat is 1.65 Joule at 150mm/min and 2000rpm. The maximum difference of the average heat transfer coefficient with the experimental results is 12.5%, which represents a good accuracy of the present results. The results also show that the average heat transfer coefficient at 100 and 150mm/min is 55% and 29.1% more, respectively, and it is 5% less at 50mm/min compared to the constant value of 20  w/ m2 k, which is considered in the previous researches. Also, thermal necrosis occurs under all conditions of natural cooling. In  forced cooling, the highest average heat transfer coefficient with normal-saline is 150mm/min at a speed of 2000rpm, which is equal to 3650 w/ m2 k, and in all conditions, the bone temperature has not exceeded the temperature limit of thermal necrosis.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 55, Issue 5
August 2023
Pages 557-576

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