SIMPLE MEASUREMENT METHOD OF HUMAN BODYS THERMAL EFFUSIVITY TO EVALUATE TACTILE WARMTH OF WOODY MATERIALS
We have treated the tactile warmth as one of good points in order to raise the use of wood and encourage planting seedlings.Firstly, we modeled human body and materials as two semi-infinite bodies with different initial temperatures and thermo-physical properties when human body touches with various materials because the governing heat transfer phenomenon on tactile warmth occurs in a minute just after the touch between human body and materials.Finally, we obtained the contact surface temperature and the heat flux by the theoretical analysis one-dimensional transient heat conduction problem between semi-infinite bodies.The contact surface temperature and the heat flux contain thermal effusivities of human body and materials.This result suggests that the governing thermo-physical property on tactile warmth is the thermal effusivity and that to know thermal effusivities of not only materials, but also human body is important in order to evaluate tactile warmth quantitatively and more accurately.In this study, we treat the possibility of simple and non-invasive measurement method of human bodys thermal effusivity.The heat flux obtained theoretically shows that human bodys thermal effusivity may be estimated from the measurement of heat flux from human body to material whose thermo-physical properties are known.We used the silicon plate as materials whose thermo-physical properties are known.We measured heat flux when palm and sole of some male students touch with the silicon plate in summer and in winter.There were differences of thermal effusivities between individuals, body parts and seasons.The thermal effusivities in winter are estimated higher than ones in summer.The measurement method was stable in summer but was not so stable in winter.It is discussed that the initial temperature of silicon plate in winter room temperature is too cold to keep human bodys initial temperature stable.
Heat Conduction Heat Flux Thermal Effusivity Tactile Warmth Woody Materials Measurement
Ryo TERADA Taiju KISHIMOTO Yoshihiro OBATA
Graduate School of Engineering, Tottori University, Tottori 680-8552, Japan Faculty of Mechanical and Physical Engineering, Tottori University, Tottori 680-8552, Japan
国际会议
12th International Congress onThermal Stresses (第十二届国际热应力大会)
杭州
英文
273-277
2019-06-01（万方平台首次上网日期，不代表论文的发表时间）