Modeling And Research On Bionic Application Silk Gland

As a unit of fluids in microfluidic system and the core unit of the micro fluid controlsystem, micro channel can control the pressure, flow rate in micro-scale. With the decreaseof the size, the surface force began to play a leading role which shows its differences withmacroscopic flow. At present, the space structure and surface characteristics of microchannel have become research focuses in the microfluidic system. As a nature microchannel network, the silk gland of silkworm is similar to micro channel in size, and it showsgood ability to control and modulate silk fibroin in the process of spinning, which providesa new train of thought for the research of micro channel.The silk gland of silkworm is the organ to product and transport silk fibroin solution,its radial dimension changes dramatically along the direction of spinning, especially thespinneret, which is complex in structure, small in size and an important place of silk fibroinsolution fibrosis. As a silk sericin circulation pipe, the structure and movement of silk glandare foundations of the study about how biomimetic micro channel influences the fluid flowcharacteristics inside. This paper focuses on the structure and movement properties of thesilk gland of silkworm and provides reliable geometric parameters for studying biomimeticmicro-channel system. In this paper, the following aspects of the study are mainly complete:(1) Study the characteristics of the silk gland spinneret structure based on sectionimage reconstruction of3D model theory, and the research method of obtaining geometricdata mainly by means of paraffin section, reconstructing silk gland digital model accordingto image data are determined.(2) Separate outlines of the spinneret in head capsule section images. Construct thebiomimetic Bombyx mori silk gland micro-channel model along the spinning direction baseon the two dimensional data. The results show that the section of spinneret is special, thestructure of the silk press lumen is elbow and there is an angel between the axe of thecommon duct and the silk press.(3) Analysis the relationship between the muscles around spinneret and the stiff planeaccording to spinning theory of silkworm. The results show that the muscle groups controlthe distance between two stiff planes, change the volume of the silk press and the sectionsquare of the entrance by relaxation and contraction itself, so it plays a role as a valuelessmicro-pump. And build a silk gland imitating micro motion model according to the motion law of spinneret. Build a silk gland imitating8-figured motion model after observing theswing law of the silkworm’s head while it’s spinning.(4) Analysis the special section shapes of each slice of silk gland, put forward a newcrescent spinneret, analysis the flow behaviors of crescent spinneret, and compared with thesame hydraulic diameter pipe, it shows that the shear stress of crescent spinneret(d=e) is lessthan crescent spinneret(d=3.25e) under the same experimental condition, and Darcy frictionfactor(f) of crescent spinneret is higher than circular pipe and Darcy friction factor is gettinghigher while the crescent spinneret is becoming flatter.