ORCID Profile
0000-0002-5430-999X
Current Organisation
Griffith University Griffith Sciences
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Mechanical engineering | Microelectromechanical systems (MEMS)
Publisher: Elsevier BV
Date: 04-2015
Publisher: Elsevier BV
Date: 04-2012
Publisher: Japan Society of Mechanical Engineers
Date: 2009
DOI: 10.1299/JTST.4.146
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 03-2008
Publisher: Japan Society of Mechanical Engineers
Date: 2005
Publisher: Wiley
Date: 2007
DOI: 10.1002/HTJ.20140
Publisher: IWA Publishing
Date: 12-01-2018
DOI: 10.2166/WST.2018.012
Abstract: Buoyancy-driven turbulent dispersion in a maturation pond is studied using a combination of field measurements and computational fluid dynamics. Modelling flow in maturation ponds requires turbulent closure models because of the large physical size and the need to model on diurnal timescales. Simulation results are shown to be more sensitive to the inclusion of a buoyancy production term appearing in the turbulent transport equations than to the model choice. Comparisons with experimental thermal profiles show that without this term, thermal mixing is over-predicted. When including the term, stratification occurs but thermal mixing is under-predicted in the lower water column. In terms of pond performance, the effect of this term is to cause increased surface die-off of Escherichia coli during sunlight hours due to the generation of stratification. It is recommended that future modelling consider and implement this term.
Publisher: Elsevier BV
Date: 12-2005
Publisher: Elsevier BV
Date: 2006
Publisher: ASMEDC
Date: 2011
Abstract: The thermal conductivities and thermal diffusivities of hydrogen were measured with a transient short hot wire method for temperature range up to 300 °C and pressure range up to 100MPa. The measured thermal conductivities showed good reproducibility and agreed with the existing values within a deviation of ±2%.
Publisher: Elsevier BV
Date: 11-2015
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2017
Publisher: Elsevier BV
Date: 03-2004
Publisher: Springer Science and Business Media LLC
Date: 05-05-2009
Publisher: ASME International
Date: 23-05-2017
DOI: 10.1115/1.4036688
Abstract: Thermomagnetic convection of a ferrofluid flow induced by the internal magnetic field around a vertical current-carrying wire was theoretically analyzed and experimentally validated for the first time. The Nusselt number for a heated 50-μm diameter wire in a ferrofluid was measured for different electrical currents and fluid temperatures. The experimental results are in a good agreement with the proposed scaling analysis. We found that increasing the current will increase the Nusselt number nonlinearly and ultimately enhances the heat transfer capability of the induced ferrofluid flow. We observed that the thermomagnetic convection becomes dominant, if large enough currents are applied.
Publisher: Springer Science and Business Media LLC
Date: 27-07-2011
Publisher: Elsevier BV
Date: 08-2006
Publisher: Elsevier BV
Date: 02-2010
Publisher: Elsevier BV
Date: 10-2020
Publisher: ASMEDC
Date: 2009
Abstract: Thermal conductivity and thermal diffusivity of CNT-nanofluids and Al2O3-nanofulids were measured by the transient short-hot-wire method. The uncertainty of their measurements is estimated to be within 1% for the thermal conductivity and 5% for the thermal diffusivity. Three different shapes of Al2O3 particles were prepared for Al2O3–water nanofluids. For the thermal conductivity of Al2O3-water nanofluids, there are differences in the enhancement of thermal conductivity for differences in particle shapes. Hardly any enhancement of thermal conductivity was observed for SWCNT-water nanofluids because the volume fraction of SWCNT was extremely low. However, we consider by increasing the volume fraction of SWCNTs, it will be possible to enhance the thermal conductivity.
Publisher: Begell House
Date: 2007
Publisher: Elsevier BV
Date: 06-2018
Publisher: Elsevier BV
Date: 03-2007
Publisher: ASMEDC
Date: 2007
DOI: 10.1115/HT2007-32550
Abstract: An experiment has been made to measure the rise in temperature of hydrogen and tank wall during filling of actual tanks to 35 and 70 MPa. Three different tank configurations are used, having volumes of 205, 130 and 39 liters. The filling time is 5 to 20 minutes. A governing equation for the filling process is proposed, which includes unknown values for heat transfer coefficients between the hydrogen and the wall and the wall and surrounding air. The values are tentatively assumed to be 500 W/(m2K) during filling and 250 W/(m2K) after filling for the inside tank wall and 4.5 W/(m2K) for the outside tank wall. The measured temperatures of the hydrogen gas and the wall are in good agreement with the calculated ones.
Publisher: Elsevier BV
Date: 07-2003
Publisher: Springer Science and Business Media LLC
Date: 17-05-2011
Publisher: Elsevier BV
Date: 04-2017
Publisher: Informa UK Limited
Date: 05-2003
DOI: 10.1080/713836243
Publisher: Elsevier BV
Date: 04-2007
Publisher: Elsevier BV
Date: 2017
DOI: 10.1016/J.WATRES.2016.10.072
Abstract: Maturation ponds are a type of waste stabilisation pond (WSP) designed to reduce carbon, nutrients and pathogens in the final stages of a WSP wastewater treatment system. In this study, a one-dimensional plug-flow pond model is proposed to predict temperature and E. coli concentration distributions and overall pond disinfection performance. The model accounts for the effects of vertical mixing and ultraviolet light-dependent die-off rate kinetics. Measurements of radiation, wind-speed, humidity and air temperature are recorded for model inputs and good agreement with measured vertical temperature distributions and outlet E. coli concentrations is found in an operational, subtropical maturation pond. Measurements and the model both show a diurnal pattern of stratification during daylight hours and natural convective mixing at night on days corresponding to low wind speeds, strong heat input from solar radiation and clear night skies. In the evenings, the thermal stratification is shown to collapse due to surface energy loss via longwave radiation which triggers top-down natural convective mixing. The disinfection model is found to be sensitive to the choice of die-off kinetics. The diurnal mixing pattern is found to play a vital role in the disinfection process by ensuring that pathogens are regularly transported to the near-surface layer where ultraviolet light penetration is effective. The model proposed in this paper offers clear advantages to pond designers by including geographical specific, time-varying boundary conditions and accounting for the important physical aspects of vertical mixing and sunlight inactivation processes, yet is computationally straightforward.
Publisher: Elsevier BV
Date: 10-2020
Publisher: Springer Science and Business Media LLC
Date: 02-04-2009
Publisher: IOP Publishing
Date: 12-08-2014
Publisher: Elsevier BV
Date: 12-2016
Publisher: Springer Science and Business Media LLC
Date: 08-07-2008
Publisher: The Institute for Research and Community Services (LPPM) ITB
Date: 31-10-2019
DOI: 10.5614/J.ENG.TECHNOL.SCI.2019.51.5.6
Abstract: Patchouli is an essential oil used in perfumes, cosmetics, soaps, insect repellents and also a candidate for biodiesel from non-edible oil. Patchouli oil from Aceh Province, Indonesia, is generally produced using a distillation process. The relationships between physical properties, i.e. the viscosity and quality, of patchouli oil from Aceh Province and blends with other oils, were investigated. The mixture oils used were palm oil, kerosene and lubricant oil SAE 40. The mixture compositions were 100:0 75:25 50:50 25:75 and 0:100 (v/v). It was found that mixing palm crude oil (25%) or lubricant oil (25%) with patchouli oil increased the viscosity by about 41% and 72%, respectively, compared with pure patchouli oil. A 53% decrease in viscosity was observed when the patchouli oil blend contained 25% kerosene. Natural variation in patchouli alcohol (PA) and iron (Fe) content in the patchouli oil s le was found to increase the value of viscosity by up to 1.5%.
Publisher: Springer Science and Business Media LLC
Date: 26-01-2012
Publisher: Elsevier BV
Date: 12-2023
Publisher: Elsevier BV
Date: 09-2021
Publisher: Elsevier BV
Date: 06-2021
Publisher: Elsevier BV
Date: 09-2021
Publisher: Springer Science and Business Media LLC
Date: 05-03-2009
Publisher: Informa UK Limited
Date: 30-10-2023
Publisher: Springer Science and Business Media LLC
Date: 11-01-2017
Publisher: Informa UK Limited
Date: 14-03-2011
Publisher: Elsevier BV
Date: 07-2019
Publisher: MDPI AG
Date: 28-05-2020
DOI: 10.3390/JMSE8060387
Abstract: Vortex-induced vibrations (VIV) of hexagonal cylinders at Reynolds number of 1000 and mass ratio of 2 are studied numerically. In the numerical model, the Navier–Stokes equations are solved using finite volume method, and the fluid-structure interaction (FSI) is modelled using Arbitrary Lagrangian Eulerian (ALE) Scheme. The numerical model accounts for the cross-flow vibration of the cylinders, and is validated against published experimental and numerical results. In order to account for different angles of attack, the hexagonal cylinders are studied in the corner and face orientations. The results are compared with the published results of circular and square cylinders. Current results show that within the studied range of reduced velocities (up to 20), unlike circular and square cylinders, no lock-in response is observed in the hexagonal cylinders. The maximum normalized VIV litudes of the hexagonal cylinders are 0.45, and are significantly lower than those of circular and square cylinders. Vortex shedding regimes of the corner-oriented hexagons are mostly irregular. However, in the face-oriented hexagons, the shedding modes are more similar to the typical P + S and 2P modes.
Publisher: Begellhouse
Date: 2014
Publisher: Elsevier BV
Date: 04-2014
Publisher: Springer Science and Business Media LLC
Date: 07-03-2022
DOI: 10.1007/S10694-022-01224-3
Abstract: The feasibility of an underground LoRaWAN bushfire temperature sensing node from the point of view of survivability in a bushfire event is considered. Thermal penetration into the soil is modelled using a one-dimensional analytical formulation for a semi-infinite solid. A working prototype of the sensor unit was tested experimentally beneath a relatively small (400 mm × 400 mm base) timber fire. A buried LoRa radio (depth 100 mm) with a k-type thermocouple monitored the temperature from beneath the fire. The analysis demonstrates that under dry soil conditions, the time that the sensor node under the fire base can endure is proportional to the square of the depth of burial of the electronic components and inversely proportional to the thermal diffusivity of the soil. The original contribution of the work is in the practical demonstration of the durability of a LoRa sensing node beneath a fire front for bushfire sensing applications.
Publisher: Elsevier BV
Date: 08-2006
Publisher: Elsevier BV
Date: 03-2000
Publisher: Elsevier BV
Date: 05-2005
Publisher: Springer Science and Business Media LLC
Date: 07-11-2009
Publisher: Springer Science and Business Media LLC
Date: 21-05-2015
Publisher: SAGE Publications
Date: 20-06-2018
Abstract: Bio-composites are increasingly being perceived as a green alternative to synthetic composites in many applications. However, the overall long-term durability of bio-composites is a major concern, particularly their ability for sustained performance under harsh and changing environmental conditions. This paper reports a detailed study on the effect of environmental conditions on the performance of flax oly(lactic acid) bio-composites. Neat poly(lactic acid) and bio-composite s les were exposed to environments similar to those found outdoors: wet, freezing and humid. Moisture absorption and physical changes of specimens were periodically examined. Flexural and tensile properties were evaluated periodically to determine the detrimental effect of each exposure condition on the mechanical performance of bio-composites. Direct contact with liquid water is the most deteriorating environment for bio-composites. A drying process can partially restore the mechanical performance of these materials. Bio-composites can survive reliably in warm humid environments and in those that could create freeze and thaw cycles for short-term outdoor applications. The mechanisms and reasons involved in the degradation of the properties of green composites are discussed.
Publisher: Elsevier BV
Date: 11-2019
Publisher: Japan Society of Mechanical Engineers
Date: 2005
Publisher: Elsevier BV
Date: 05-2013
Publisher: Wiley
Date: 2004
DOI: 10.1002/FLD.784
Publisher: Elsevier BV
Date: 09-2021
Publisher: Springer Science and Business Media LLC
Date: 27-06-2008
Publisher: Informa UK Limited
Date: 25-06-2009
Publisher: Elsevier BV
Date: 2009
Publisher: Elsevier BV
Date: 09-2018
Start Date: 07-2023
End Date: 06-2026
Amount: $507,466.00
Funder: Australian Research Council
View Funded Activity