Search for dissertations about: "jet contraction"

Showing result 1 - 5 of 10 swedish dissertations containing the words jet contraction.

  2. 1. Sound generation in metal flue organ pipes: On the influence of asymmetric flue exit geometry and vibrations of the upper labium with particular emphasis on the early response

    Author : Matthias Scholz; Chalmers tekniska högskola; []
    Keywords : jet contraction; wall vibrations; CFD; jet velocity profile; tap tone; asymmetry of flue exits; operational deflection shapes; Coanda effect; yielding upper labium; modal analysis; bottom clamped cylinder; vibration measurements; metal flue organ pipes; dipole; initial jet formation;

    Abstract : Sound generation in flue organ pipes is caused by the non-linear interaction between an instable jet and a tube resonator. Our understanding of this very complex physical process is still incomplete, and there is not yet a model that can explain all details of the richness in pipe sound which can be achieved by a trained organ pipe voicer. READ MORE

  4. 2. Turbulent Shear Flow Experiments: Design of Natural Convection Rig and LDA Measurement in Swirling Jets

    Author : Abolfazl Shiri; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Self-Similar Solution; Natural Convection Boundary Layer; Axisymmetric Jet; Laser Doppler Anemometry; Swirl Number;

    Abstract : This work consist of two sections. In the first part, a facility has been installed and modified from an existing rig in order to measure velocity and temperature field of axisymmetric turbulent natural convection boundary layers. With using laser doppler anemometry and cold wire resistance thermometry. READ MORE

  5. 3. Nozzle design for pulsed water jets : an analytical, numerical and experimental study

    Author : Rolf Lövgren; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strömningslära; Fluid Mechanics;

    Abstract : A study is made of the early time behaviour of pulsed water jets generated by the action of a shock wave moving through a waterfilled nozzle. In particular the influence of nozzle geometry on the exit velocity is examined. READ MORE

  6. 4. Hair cell and organ of corti responses to normal and intense acoustic stimulation

    Author : Anders Fridberger; Karolinska Institutet; Karolinska Institutet; []
    Keywords : Cochlea; outer hair cells; calcium; pressure changes; micromechanics; noise-induced hearing loss; fluorescent indicators; laser interferometry; temporal bone preparation; guinea pig;

    Abstract : The principal aims of the studies described in this thesis were to develop an in vitro model for studying acoustic overstimulation at the cellular level, to define the electrical and mechanical response characteristics of the perfused temporal bone preparation, and to investigate the effects of intense sound stimulation on the calcium levels of the hair cells in the intact hearing organ. In the in vitro model for acoustic overstimulation, isolated cochlear outer hair cells were subjected to a pressure jet emanating from a glass micropipette aimed at the cell body. READ MORE

  7. 5. Clinical and experimental studies on the diaphragm during physiological and pathophysio-logical conditions

    Author : Antonella Lo Mauro; Peter Frykholm; Andrea Aliverti; Anders Larsson; Stephen Edward Rees; Uppsala universitet; []
    Keywords : diaphragm; animal model; phrenic nerve injury; pregnancy; lung transplan- tation; stereotactic body radiation therapy; anesthesia; Clinical Physiology; Klinisk fysiologi;

    Abstract : The diaphragm is the most important respiratory muscle. It separates the thorax from the abdomen and it is innervated by phrenic nerve. READ MORE