Browsing Mechanical, Manufacturing & Biomedical Eng by Author "PERSOONS, TIM"
Now showing items 1-20 of 28
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A Comparison between steady jets and synthetic jets at low Reynolds numbers
PERSOONS, TIM; MURRAY, DARINA (ASME, 2008) -
Effect of oscillation frequency on wall shear stress and pressure drop in a rectangular channel for heat transfer applications
PERSOONS, TIM (2016)The exploitation of flow unsteadiness in microchannels is a potentially useful technique for enhancing cooling of future photonics systems. Pulsation is thought to alter the thickness of the hydrodynamic and thermal boundary ... -
Experimental Validation of a Computational Fluid Dynamics Methodology for Transitional Flow Heat Transfer Characteristics of a Steady Impinging Jet
PERSOONS, TIM; MURRAY, DARINA (2014)This paper presents a computational fluid dynamics (CFD) methodology to accurately predict the heat transfer characteristics of an unconfined steady impinging air jet in the transitional flow regime, impinging on a planar ... -
Feasibility Study and Cost-Benefit Analysis of Tidal Energy: A Case Study for Ireland
PERSOONS, TIM (2012)Ireland set out to produce 33% of its electricity demand from renewable sources by 2020 and reduce emissions to the level of 1990 in accordance with the Kyoto agreement. These targets require investments in a diverse ... -
Flow regime characterisation of an impinging axisymmetric synthetic jet
MURRAY, DARINA; PERSOONS, TIM (2013)Impinging synthetic jets have excellent potential for energy-efficient local cooling in confined geometries. For a given geometry, synthetic jet flows are mainly characterised by the Reynolds number and the ratio of stroke ... -
Fluctuating and time averaged heat transfer characteristics of a steady jet at low Reynolds numbers
PERSOONS, TIM; MURRAY, DARINA (2009) -
Forced convection in the wakes of sliding bubbles
MURRAY, DARINA; PERSOONS, TIM (2016)Both vapour and gas bubbles are known to significantly increase heat transfer rates between a heated surface and the surrounding fluid, even with no phase change. However, the complex wake structures means that the surface ... -
A general correlation for the stagnation point Nusselt number of an axisymmetric impinging synthetic jet
MURRAY, DARINA; PERSOONS, TIM (2011)Whereas the heat transfer mechanisms in steady impinging jets are well understood, the available knowledge of heat transfer to impinging synthetic jets remains inconsistent. This paper provides an objective comparison of ... -
General Reduced-Order Model to Design and Operate Synthetic Jet Actuators
PERSOONS, TIM (2012)Synthetic jets are used in various applicat ions from flow contro l to thermal management of electronics. Controlling the jet operating point using a simple voltage to velocity calibration becomes unreliable in case ... -
Heat transfer and air temperature measurements of an impinging synthetic air jet
MURRAY, DARINA; PERSOONS, TIM (2009)Synthetic jets are a relatively new technology that can achieve high rates of heat transfer. They have been shown to out-perform comparable steady impinging jets without the need for an external air supply system. The ... -
Heat transfer and flow structure evaluation of a synthetic jet emanating from a planar heat sink
MURRAY, DARINA; PERSOONS, TIM (2014)Direct impinging synthetic jets are a proven method for heat transfer enhancement, and have been subject to extensive research. However, despite the vast amount of research into direct synthetic jet impingement, there ... -
Heat transfer behaviour of a dilute impinging air-water mist jet at low wall temperatures
MURRAY, DARINA; PERSOONS, TIM (2017) -
Heat transfer characteristics of swirling impinging jets
PERSOONS, TIM; MURRAY, DARINA BRIDGET (ASME, 2009)Impinging jets are used in a wide number of industrial cooling applications due to their high heat and mass transfer abilities. The current research is concerned with the effect of swirl on the heat transfer characteristics ... -
Heat transfer in adjacent interacting impinging synthetic jets
MURRAY, DARINA; PERSOONS, TIM (ASME, 2009)An impinging synthetic jet can attain heat transfer rates comparable to a continuous jet, without net mass input. However it needs a forced cross-flow to supply fresh cooling medium. The vectoring effect of adjacent synthetic ... -
High dynamic range particle image velocimetry applied to heat convection studies
PERSOONS, TIM (2014)Convective heat transfer occurs in a wide range of engineering applications, from nuclear reactors to portable electronic devices. Accurate whole-field turbulence and flow measurements are crucial to understanding convective ... -
High dynamic range whole-field turbulence measurements in impinging synthetic jets for heat transfer applications
PERSOONS, TIM; MURRAY, DARINA; FARRELLY, RAYHANN (2010)For applications requiring high local heat transfer rates, recent research has shown that impinging synthetic jets perform comparably to continuous jets, yet without needing external mass flow input. In spite of recent ... -
High dynamic velocity range particle image velocimetry using multiple pulse separation imaging
PERSOONS, TIM (2011)The dynamic velocity range of particle image velocimetry (PIV) is determined by the maximum and minimum resolvable particle displacement. Various techniques have extended the dynamic range, however flows with a wide velocity ... -
High-resolution hot-film measurement of surface heat flux to an impinging jet
MURRAY, DARINA; PERSOONS, TIM (2011)To investigate the complex coupling between surface heat transfer and local fluid velocity in convective heat transfer, advanced techniques are required to measure the surface heat flux at high spatial and temporal resolution. ... -
Improving the measurement accuracy of PIV in a synthetic jet flow
PERSOONS, TIM; MURRAY, DARINA (2008) -
Natural convection from isothermal horizontal cylinders
PERSOONS, TIM; MURRAY, DARINA; BYRNE, GERARD (ASME, 2009)The research described here is concerned with natural convection from isothermal cylinders, with a particular focus on the interaction between a pair of vertically aligned cylinders. Prime attention was focused on how ...