2016-08-26 13:01
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Imager sCMOS PIV相机
型号: Imager sCMOS
产地:
品牌: LaVision GmbH
面议
参考报价
体视层析粒子成像测速系统(Tomo-PIV)
型号: FlowMaster®-Tomo
产地:
品牌: LaVision GmbH
¥ 120万 - 150万
参考报价
时间分辨粒子成像测速系统(TR-PIV)
型号: FlowMaster®-TR
产地:
品牌: LaVision GmbH
¥ 150万 - 200万
参考报价
德国LaVision PIV/PLIF粒子成像测速场仪
型号: FlowMaster®
产地:
品牌: LaVision GmbH
¥ 150万 - 200万
参考报价
自适应粒子成像测速场仪(PIV)
型号: FlowMaster®-Adaptive
产地:
品牌: LaVision GmbH
¥ 150万 - 200万
参考报价
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湍流本质上具有三维(3D)立体结构属性。普通的二维(2D)包 括采用激光照明的成像测量无法在所有三个空间维度上分辨湍流 的结构。而利用多视角成像信息,采用层析重构技术则可以在三 个空间维度上同时捕捉记录复杂流动的瞬态结构。应用针对体像 素的三维(3D)相关处理技术,可以由时间相关的体成像数据计 算出瞬态三维空间的流场。 LaVision功能强大的,基于层析粒子成像测速(Tomo-PIV)和层 析粒子跟踪测速(Tomo-PTV)技术的FlowMaster激光成像系统, 能够以极高的空间分辨率记录强湍流,火焰以及喷雾对象的瞬态 体视流场。
Single-shot, tomographic imaging of the three-dimensional concentration field is demonstrated in a turbulent gaseous free jet in co-flow using volumetrically illuminated laser-induced fluorescence. The fourthharmonic output of an Nd:YAG laser at 266 nm is formed into a collimated 15 × 20 mm2 beam to excite the ground singlet state of acetone seeded into the central jet. Subsequent fluorescence is collected along eight lines of sight for tomographic reconstruction using a combination of stereoscopes optically coupled to four two-stage intensified CMOS cameras. The performance of the imaging system is evaluated and shown to be sufficient for recording instantaneous three-dimensional features with high signal-tonoise (130:1) and nominal spatial resolution of 0.6–1.5 mm at x/D = 7–15.5.
Many marine organisms have complex life histories, having sessile adults and relying on the planktonic larvae for dispersal. Larvae swim and disperse in a complex fluid environment and the effect of ambient flow on larval behavior could in turn impact their survival and transport. However, to date, most studies on larvae–flow interactions have focused on competent larvae near settlement. We examined the importance of flow on early larval stages by studying how local flow and ontogeny influence swimming behavior in pre-competent larval sea urchins, Arbacia punctulata. We exposed larval urchins to grid-stirred turbulence and recorded their behavior at two stages (4- and 6-armed plutei) in three turbulence regimes. Using particle image velocimetry to quantify and subtract local flow, we tested the hypothesis that larvae respond to turbulence by increasing swimming speed, and that the increase varies with ontogeny.
This paper describes the development of an experimental technique that combines simultaneous planar laser-induced fluorescence (PLIF) and infrared (IR) thermography imaging, and its application to the measurement of unsteady and conjugate heat-transfer in harmonically forced, thin liquid-film flows falling under the action of gravity over an inclined electrically heated-foil substrate. Quantitative, spatiotemporally resolved and simultaneously conducted measurements are reported of the film thickness, film free-surface temperature, solid–liquid substrate interface temperature, and local/instantaneous heat flux exchanged with the heated substrate. Based on this information, local and instantaneous heat-transfer coefficients (HTCs) are recovered. Results concerning the local and instantaneous HTC and how this is correlated with the local and instantaneous film thickness suggest considerable heat-transfer enhancement relative to steady-flow predictions in the thinner film regions.