共查询到19条相似文献,搜索用时 546 毫秒
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玻璃三通微流体管道热流变拉制仪的研制 总被引:1,自引:1,他引:0
在玻璃三通微流体管道热流变拉伸成形工艺基础上,设计了玻璃三通微流体管道热流变拉制仪。在三通微管道拉伸成形过程中,变形区热软化后的V形玻璃毛细管,在冷却过程中一次性拉制成三通微管道,储液池在拉制过程的同时成型,并与三通管光滑连接。拉制仪可实现等内径和不等内径拉伸。通过对加热时间、拉伸行程和玻璃材料分配系数的调节,可以控制三通微管道各项参数。制备出的三通微管道内径在微米级,三根微管道在三通结点处光滑连通,表面张力成型的微管道具有较高的表面质量。以三通微管道和一维玻璃微管道为基础单元,组建了微流体管道网络。 相似文献
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为了获得具有良好微流动特性的圆截面微流体器件,并构建二维裸微结构微流体管道网络,设计了玻璃三通微流体管道热流变拉制仪.在三通微管道拉伸成形过程中,变形区热软化后的V形玻璃毛细管,可在冷却过程中一次性拉制成三通微管道,储液池在拉制过程的同时成型,并与三通管光滑连接.拉制仪可实现等内径和不等内径拉伸.通过对加热时间、拉伸行程和玻璃材料分配系数的调节,可以控制三通微管道各项参数.制备出了内径为67、32和20μm的圆截面三通微管道.它的三根微管道在三通结点处光滑连通;由于表面张力成型,微管道具有较高的表面质量.最后,以三通微管道和一维玻璃微管道为基础单元,组建了微流体管道网络. 相似文献
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玻璃微流体器件制备仪的设计研究 总被引:2,自引:0,他引:2
微流控系统在很多应用场合需要采用透明材质,针对玻璃材料在加热到半熔融状态时可以塑形,设计了水平式的微流体器件制备仪.样机经实验后,可以制作出微米级的玻璃微针、微管道等器件.该制备仪结构简洁、成本较低、操作简单. 相似文献
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为了研究钎料、磨粒、钎焊温度对金刚石线锯抗拉性能的影响,利用高频感应加热设备在氩气中进行了钎焊金刚石线锯的制备,在万能试验机上进行了拉伸试验,分析了线锯抗拉性能的影响因素。结果表明:高温钎焊后,线锯的抗拉强度下降明显。 相似文献
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数字化微喷射用直列微喷嘴制作工艺 总被引:2,自引:1,他引:1
为解决玻璃微管道拉制工艺制作的单孔微喷嘴存在容易脆断,微管道长度不易控制,微喷射效率低等问题,提出了一种新的微喷嘴制作工艺.该工艺延续了微喷嘴拉制工艺中非IC工艺和低成本的制作特点,仍以低流阻的圆截面为喷口形状,通过材料流变运动和冷却时收缩率不同,将多根微管道紧密嵌入到塑料管中;通过毛细腐蚀作用.制作出变内径的锥形管,并实现微喷管长度的控制.制作了内径50 μm的 4 孔微喷嘴和 lO 孔微喷嘴,锥管长为750 μm,微喷管长2.5mm.使用制作的微喷嘴在微流体数字化驱动平台上进行了水性液体在油相和气相中的微喷射实验,制备了 80 μm的微滴和微滴阵列.实验表明,该工艺制作的直列微喷嘴可以在微流体数字化驱动下实现较好的数字化微喷射效果. 相似文献
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This paper presents a study on the temperature profile in the bending process of glass pipettes. To prevent undesirable deformation
of the pipette at its bending section, such as kink and constriction, several factors influencing the bending quality are
investigated, including the width and temperature of the heating element, heating and bending time. Taguchi method is used
to study the key factors and to identify an optimal parameter combination. ANSYS is also employed to study the heat transfer
and temperature distribution in the heating zone. It is concluded that the temperature distribution in the bending area is
critical to the bending quality, and the width of the heating element decisively determines the temperature distribution. 相似文献
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The spherical roller bearings, used to support the drier rolls in paper machines, experience premature failure in which external heating and water contamination of the lubricant have been implicated. An apparatus was designed, built and commissioned to simulate the conditions acting on these bearings. A pilot study was performed to examine the effect of the external heating on lubricant film thickness and ultimately on bearing failure. The amount of surface damage sustained by the test bearings increased as the estimated lambda parameter decreased. Furthermore, oil deposit formation was similar to that reported in the literature for drier roll bearings, thereby supporting the validity of the experimental simulation. 相似文献
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《Measurement》2016
When a hypersonic aircraft flies at a high Mach number, the plate-like attitude control structures, such as the wings and rudders, will be exposed to an extremely high-temperature environment. To obtain the thermal modal parameters of a structure that are difficult to measure, a high-temperature transient heating test system and a vibration test system were combined to establish a test system that can perform the thermal/vibration test at 1200 °C. Infrared radiation heating was employed to generate a controlled time-varying high-temperature environment, and an exciter was used to exert vibration excitation on the free end of the cantilever rectangular plate. A self-developed extension configuration of a high-temperature-resistant ceramic pole was used to transfer the vibration signals of the structure to a non-high temperature zone, and the acceleration sensors were applied to identify the vibration signals. The test data were analyzed using a time-frequency joint analysis technique, and next, the key vibration characteristic parameters of structure in a thermal-vibration coupled environment up to 1200 °C (e.g., the modal frequency and modal vibration shape) were experimentally obtained. In addition, the numerical simulation on the thermal modal characteristics of a rectangular plate was performed. The calculated results coincide favorably with the test results, verifying the credibility and effectiveness of the experimental methods. The research results can provide an important basis for the dynamic performance analysis and safety design of structure under high-temperature thermal-vibration conditions for hypersonic flight vehicles. 相似文献
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针对目前对双冷源新风机组与辐射板联合运行供暖系统应用于办公室的运行特性的研究很少的现状,搭建了金属辐射板与双冷源新风机组系统测试平台,测试了金属辐射板与双冷源新风机组空调系统供暖运行状态,以及双冷源新风机组供热性能、空气源热泵制热性能以及室内温度分布特性和室内空气品质.结果表明,金属辐射板与双冷源新风机组空调系统冬季供... 相似文献
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The length of the molten zone determines the length of pulled optical fibre tips. Tips produced by laser or filament heating are rather lengthy. By using a foil heater the taper length can be shortened and cone angles in the order of 30° can reproducibly be obtained. For varying the drawing force there is an optimum temperature range where the taper shape is monotonic for the whole tip. The tip end diameter is well below 100 nm for optimized pulling conditions. 相似文献