Numerical Simulation And Uncertainty Analysis Of 3D Temperature Field Of Tongue

The heat transfer problem of tongue involves complicated physiological mechanism of human apparatus. It will absolutely advance tongue inspection of traditional Chinese medicine, as well as help to bio-heat transfer development if carries on further investigation. The purpose of this paper is to study 3D heat transfer characteristic and obtain 3D temperature field of tongue. By introducing the interdisciplinary science method and obtaining vessel model of porcine tongue through vessel cast experiment, 3D temperature field of tongue in allusion to real vessel shape was simulated by finite element method, which has great significance on both numerical heat transfer and bio-heat transfer.In this paper, two temperature measurement― infrared thermovision and thermocouple were used to ensure the measure precision of organism temperature. Advanced apparatus CBI8000 series Doppler blood flowmeter was used to measure biological physical properties. Vessel cast of porcine tongue was set as physical model, and then by improving the heat transfer boundary condition, finite element method was used to simulate 3D temperature field of porcine tongue, and corresponding 3D temperature field that accord with actual status was obtained. This physical modeling method was first used to bio-heat transfer computation home and abroad. In the end error analysis method was used to analyze the effect of physical and geometry properties on 3D temperature that just obtained. In the process of calculation, effective blood convection coefficient was deduced from classical heat transfer theory, and was set on the vessel wall as a third boundary condition, which made the calculation result more reasonable.Research results indicate that 3D temperature field of tongue was in much correlative to its vessel distribution. The trunk vessel dominates the temperature distribution of tongue. Vessels whose diameter less than 0.33mm almost have no impact on surface temperature in root and middle of tongue, but on tip of tongue it influences greatly. Furthermore, uncertainty of vessel distribution will bring much temperature uncertainty inside tissue. The effect of metabolic heat was to raise temperature, and which on root is larger than on middle and tip of tongue, especially when the whole temperature is small, it cannot be neglect. Compared to tissue conductivity and metabolic heat, surface heat transfer coefficient and ambient temperature can bring much more uncertainty on surface temperature of tongue. The...