Preparation Of Elastic Thermal Conductive Bionic Functional Surface And Study Of Fluid Control Mechanism

The study confirmed that the flexibility, elasticity and temperature of dolphins skin can play a role in controlling the shunt of fluid synergistically, stabilizing turbulent and reducing the liquid viscous of boundary layer,thus reducing the fluid resistance. Inspired by the above phenomena, the paper based on the biological characteristics of dolphin skin prepared an elastomeric thermal conductive composites bionic functional surface. The bionic functional surfaces with silicone rubber whose flexibility and elasticity were similar to dolphins skin, used elastomeric as substrate and select grapheme(GPL)as a conductive filler, three different graphene content(Content of 0.18wt%、0.36wt%、0.72wt%)elastomeric thermal bionic functional surfaces had been prepared, referred to as GPL/SR( SR).The bionic functional surfaces had been characterized and analyzed by the tests of TEM(SR), SEM(SR),DSC(SR)and DTG(SR).The results showed that the GPL different graphene content under / SR silicone rubber(SR) of the DSC curves similar only had one glass transition temperature(Tg), one crystalline melting point(Tm), and their peaks very sharply evident. The glass transition temperature of content of 0.18wt% cases GPL / SR obtained reduced. It indicated that adding a small amount of graphene can improve the elastic deformation of silicone rubber base material in the case of the better dispersion of grapheme.The addition of graphene improves the high-temperature resistance ability of SR material. The initial decomposition temperature of three content GPL/SR compared to silicone rubber( SR) initial decomposition temperature was improved, especially the content of graphene 0.36 wt GPL/SR which increased the most obvious, compared with SR two initial temperature were increased by 38° and 59°.There?bter, the hardness and tensile properties studies of the GPL/SR bionic functional surface are carried out by comparison with the(SR)surface, the results show: with the increase of graphene content the hardness and elasticity of the GPL/SR bionic functional surface rise; since good dispersion properties and strong binding with silicone rubber base material the elastic modulus of the GPL/SR is lower than the SR when the content of graphene is 0.18 wt%; although the tensile strength, tear strength and elongation at break of the GPL/SR bionic functional surface is better than the(SR), those variables reach the maximum value when the content of graphene is 0.36 wt%.The results of thermal performance test which is between the GPL/SR bionic functional surface and the(SR)surface suggest: since the thermally conductive filler changed(SR)rely phonon heat transfer, so that the thermal network chain formed inside SR achieve heat transfer function, the heat transfer performance of the three kinds of GPL/SR bionic functional surfaces are improved. When the content of graphene is 0.72wt% the GPL/SR bionic functional surface`s thermal conductivity increased by 50%. There exists an optimal content of graphene that the thermal conductivity of the GPL/SR bionic functional surfaces reaches a maximum. Through experimental analysis the optimal dosage of graphene is 0.36wt%.By testing the flow rate relationship of the sample`s droplet-surface, this paper obtains the fluid control mechanism of the elastic thermal bionic functional surfaces.By altering the thermal conductivity of the GPL/SR bionic functional surface the kinematic viscosity of the fluid medium can be controlled. Through test and analysis it can concluded that the droplet velocity(resistance) exists a critical turning point of equilibrium temperature. Below the turning point, when hitting temperature increasing the GPL/SR bionic functional surface achieves maximum deceleration resistance value by controlling the contact resistance with the solid wall surface of the droplets ?b and droplet internal viscous shear resistance ?b simultaneously. Above the turning point, when hitting temperature increasing the droplet surface tensionreduces,?a increases sharply. when the increment of ?a is bigger than the reduction of ?b, the total resistance increases while its velocity decreases.