(1 - 20 of 136)

Pages

document
Kato, H. (author), Koike, S. (author), Nakakita, K. (author), Ito, T. (author), Shiohara, T. (author), Kato, C. (author), Iida, A. (author), Doi, Y. (author), Kato, Y. (author), Miura, Y. (author)
conference paper 2013
document
Kim, S. (author), Kim, D.E. (author), Euh, D.J. (author)
Thermal stratification is encountered in large pool of water increasingly being used as heat sink in new generation of advanced reactors. These large pools at near atmospheric pressure provide a heat sink for heat removal from the reactor or steam generator, and the containment by natural circulation as well as a source of water for core cooling...
conference paper 2013
document
Lynch, K. (author), Scarano, F. (author)
A tomographic PIV system is introduced for the instantaneous measurement of the material derivative of velocity (VMD). The system is able to operate with very short temporal separation and is therefore suitable for applications in high-speed flows. The method of operation consists of the imaging of a measurement volume using an array of 12 CCD...
conference paper 2013
document
Fiscaletti, D. (author), Elsinga, G.E. (author), Westerweel, J. (author)
The present work involves the investigation of the fine scale motions in the turbulent region of a high Reynolds number air jet. In the fully developed region of the jets, the small scales of turbulence are assumed to be isotropic, and expected to contain elongated vortices (worms), whose diameter scales with the Kolmogorov length scale. Aimed...
conference paper 2013
document
Jeon, Y.J. (author), Chatellier, L. (author), David, L. (author)
A new time-resolved PIV (TR-PIV) method is introduced by integrating both two concepts, the fluid parcel tracking [1] and the ensemble averaged correlation [2, 3]. The dynamic range is extended by applying the polynomial trajectory as the fluid motion [1]. The tracking procedure is not performed by using individual locations of the fluid parcel...
conference paper 2013
document
Hess, D. (author), Sastuba, M. (author), Kitzhofer, J. (author), Brücker, C. (author)
This work describes the flow around a sphere with a longitudinal hole inside. Such ring-type particles are useful in many applications like chemical reactors as catalysts (seed particles) to increase the reacting surface in the multi-phase flow. Both heat transfer and the flow structure in and around those catalysts are of interest for fixed bed...
conference paper 2013
document
Sancho, I. (author), Varela, S. (author), Pallares, S. (author), Vernet, A. (author)
An axisymmetric confined, reactive and laminar flow has been analysed, both experimentally and numerically. The cavity is cylindrical with a rotating end wall varying its aspect ratio and the angular velocity of the rotating wall. The experimental techniques applied are the Particle Image Velocimetry (PIV) and the Planar Laser Induced...
conference paper 2013
document
Birvalski, M. (author), Tummers, M. (author), Delfos, R. (author), Henkes, R.A.W.M. (author)
The technique for obtaining detailed velocity fields in a wavy liquid layer in stratified air/water pipe flow is described in this paper. By combining Particle Image Velocimetry (PIV) with an interface detection technique, the velocity field is resolved in the whole liquid layer. Furthermore, since the shape of the interface is resolved at each...
conference paper 2013
document
Ding, L. (author), Discetti, S. (author), Adrian, R.J. (author), Gogineni, S. (author)
Many conventional experimental methods in fluid mechanics, such as LDV and HWA, are not able to measure simultaneous acceleration fields directly. Double-pulse PIV is extended to the multiple-pulse PIV enabling people to directly extract acceleration fields as well as to achieve better accuracy in the velocity measurement [13]. We evaluate the...
conference paper 2013
document
Ono, Y. (author), Motosuke, M. (author), Honami, S. (author)
A synthetic jet is one of flow control devices that can topologically disturb surrounding flow field by adding periodic injection and suction of surrounding fluid using an oscillating membrane through an orifice. This device can be applied to the downsized fluid machinery without a net mass injection of fluid for the simplified structure. In...
conference paper 2013
document
Lemke, M. (author), Sesterhenn, J. (author)
The aim of the study is the application and validation of an adjoint based data assimilation method for the determination of timedependent pressure fields from velocity data obtained by particle image velocimetry (PIV). The method is based on the full compressible Navier-Stokes equations. No additional constraints like incompressibility or...
conference paper 2013
document
Im, S. (author), Heo, G.E. (author), Sung, H.J. (author), Kim, S.K. (author)
Flow inside a scaled model of nasal cavity was measured by tomographic PIV. The model was constructed with transparent silicon. A refractive index of working fluid was matched to the model index by mixing glycerol and water. Four cameras and double pulse laser system were used for tomographic PIV. To obtain high SNR, red fluorescence particles...
conference paper 2013
document
Rossi, M. (author), Marin, A. (author), Wang, C. (author), Hilgenfeldt, S. (author), Kähler, C.J. (author)
Ultrasound-driven gas bubbles can be used as active actuators to create or modify the flow in microfluidic devices. Oscillating bubbles are able to create a steady streaming flow that can be used to perform several tasks in microfluidic devices. In this work, we focus on a specific configuration with a bubble located at a side wall of a...
conference paper 2013
document
Alekseenko, M.V. (author), Bilsky, A.V. (author), Dulin, V.M. (author), Markovich, D.M. (author), Tokarev, M.P. (author)
The present work is devoted to the application of the Tomographic PIV technique to study coherent structures in a swirling turbulent jet. The aim of the paper is to study the possibilities of caring out tomographic PIV measurements with the large depth of a volume configuration in the swirling jet setup. It is recognized that an extension of the...
conference paper 2013
document
Roosenboom, E.W.M. (author), Geisler, R. (author), Agocs, J. (author), Schanz, D. (author), Weikert, T. (author), Kirmse, T. (author), Schröder, A. (author)
Multiple optical measurement techniques have been applied for the investigation of a propeller-wing wind tunnel model. The (half) wind tunnel model is equipped with a nine bladed propeller and its wing has active Coanda blowing over the whole span of the wing. The aim of the investigation is to gain understanding of the flow phenomena,...
conference paper 2013
document
Tokgoz, S. (author), Elsinga, G.E. (author), Westerweel, J. (author)
Time-resolved tomographic PIV was used to investigate the time evolution of turbulent flow structures in Taylor-Couette flow. Turbulence is created by the shear due to exact counter rotation of the cylinders, where the mean velocity is zero in the bulk flow. This enables to observe the structures longer than many other turbulent flow types,...
conference paper 2013
document
Ninomiya, N. (author), Tsukada, S. (author), Ikeda, M. (author)
Although the phenomena related to the multiphase flow can be found in many kinds of industrial and engineering applications, the physical mechanism of the multiphase flow has not been investigated in detail. The major reason for the lack of data in the multiphase flow lies in the difficulties in measuring the flow quantities of the multiple...
conference paper 2013
document
Although the use of Finite Time Lyapunov Exponents (FTLE) to infer Lagrangian Coherent Structures (LCS) is acknowledged in literature, few studies have been devoted to the analysis of LCS derived from experimental three-dimensional velocity fields, especially in case of pulsatile flows. In this work we investigate the application of FTLE for the...
conference paper 2013
document
Teodori, E. (author), Moita, A.S. (author), Moreira, A.L.N. (author)
The present work introduces an alternative approach which combines heat transfer measurements, high speed visualization and PIV to infer on the effect of surface micro-structuring in the various heat transfer parcels. The PIV provides particularly interesting information on the bubbles vertical velocity, allowing to infer how the microstructures...
conference paper 2013
document
Seo, J.H. (author), Seol, D.M. (author), Lim, T.G. (author), Park, S.T. (author), Han, B.W. (author), Rhee, S.H. (author)
Detailed information of the flow around a ship is essential for designing the hull because it is related to the propeller performance, maneuverability, and vibration. Thus, lots of experimental and computational researches have been executed to measure or analyze the stern flow of vessels. In this paper, the newly installed underwater SPIV...
conference paper 2013
(1 - 20 of 136)

Pages