The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform

Alessandro Gomez - One of the best experts on this subject based on the ideXlab platform.

  • Laminar counterflow steady diffusion flames under high Pressure (P ⩽ 3 MPa) conditions
    Combustion and Flame, 2020
    Co-Authors: Lorenzo Figura, Alessandro Gomez
    Abstract:

    Abstract An exPerimental system was designed to stabilize steady counterflow methane diffusion flames at elevated Pressures, uP to 3 MPa. In contrast with the much more common coflow configuration, the counterflow one is advantageous for the following reasons: the suPPression of buoyancy instabilities that tyPically Plague coflow flames at high Pressures; the one-dimensionality of the flame, that enables comPutational modeling with very large chemical kinetic mechanisms; and the high level of control that it Provides on soot loading. Above 0.8 MPa, the rePlacement of nitrogen with helium as inert was found to be critical to stabilize well behaved flames with resPect to steadiness, laminarity, adiabaticity, one-dimensionality and flame thickness. Scaling and exPerimental considerations allowed for the identification of accePtable oPerating conditions in terms of Pressure and strain rate and yielded a synthetic rePresentation of a domain of diffusion flames of good quality. Such a graPh can inform the design of a high-Pressure counterflow system with resPect to the selection of burner geometry, diagnostic techniques and exPerimental conditions, allowing for the exPerimentalist to sidesteP costly and time consuming trial and error. Measurements by thin-filament Pyrometry and numerical simulations confirmed the ProPosed scaling.

  • laminar counterflow steady diffusion flames under high Pressure P 3 mPa conditions
    Combustion and Flame, 2012
    Co-Authors: Lorenzo Figura, Alessandro Gomez
    Abstract:

    Abstract An exPerimental system was designed to stabilize steady counterflow methane diffusion flames at elevated Pressures, uP to 3 MPa. In contrast with the much more common coflow configuration, the counterflow one is advantageous for the following reasons: the suPPression of buoyancy instabilities that tyPically Plague coflow flames at high Pressures; the one-dimensionality of the flame, that enables comPutational modeling with very large chemical kinetic mechanisms; and the high level of control that it Provides on soot loading. Above 0.8 MPa, the rePlacement of nitrogen with helium as inert was found to be critical to stabilize well behaved flames with resPect to steadiness, laminarity, adiabaticity, one-dimensionality and flame thickness. Scaling and exPerimental considerations allowed for the identification of accePtable oPerating conditions in terms of Pressure and strain rate and yielded a synthetic rePresentation of a domain of diffusion flames of good quality. Such a graPh can inform the design of a high-Pressure counterflow system with resPect to the selection of burner geometry, diagnostic techniques and exPerimental conditions, allowing for the exPerimentalist to sidesteP costly and time consuming trial and error. Measurements by thin-filament Pyrometry and numerical simulations confirmed the ProPosed scaling.

Lorenzo Figura - One of the best experts on this subject based on the ideXlab platform.

  • Laminar counterflow steady diffusion flames under high Pressure (P ⩽ 3 MPa) conditions
    Combustion and Flame, 2020
    Co-Authors: Lorenzo Figura, Alessandro Gomez
    Abstract:

    Abstract An exPerimental system was designed to stabilize steady counterflow methane diffusion flames at elevated Pressures, uP to 3 MPa. In contrast with the much more common coflow configuration, the counterflow one is advantageous for the following reasons: the suPPression of buoyancy instabilities that tyPically Plague coflow flames at high Pressures; the one-dimensionality of the flame, that enables comPutational modeling with very large chemical kinetic mechanisms; and the high level of control that it Provides on soot loading. Above 0.8 MPa, the rePlacement of nitrogen with helium as inert was found to be critical to stabilize well behaved flames with resPect to steadiness, laminarity, adiabaticity, one-dimensionality and flame thickness. Scaling and exPerimental considerations allowed for the identification of accePtable oPerating conditions in terms of Pressure and strain rate and yielded a synthetic rePresentation of a domain of diffusion flames of good quality. Such a graPh can inform the design of a high-Pressure counterflow system with resPect to the selection of burner geometry, diagnostic techniques and exPerimental conditions, allowing for the exPerimentalist to sidesteP costly and time consuming trial and error. Measurements by thin-filament Pyrometry and numerical simulations confirmed the ProPosed scaling.

  • laminar counterflow steady diffusion flames under high Pressure P 3 mPa conditions
    Combustion and Flame, 2012
    Co-Authors: Lorenzo Figura, Alessandro Gomez
    Abstract:

    Abstract An exPerimental system was designed to stabilize steady counterflow methane diffusion flames at elevated Pressures, uP to 3 MPa. In contrast with the much more common coflow configuration, the counterflow one is advantageous for the following reasons: the suPPression of buoyancy instabilities that tyPically Plague coflow flames at high Pressures; the one-dimensionality of the flame, that enables comPutational modeling with very large chemical kinetic mechanisms; and the high level of control that it Provides on soot loading. Above 0.8 MPa, the rePlacement of nitrogen with helium as inert was found to be critical to stabilize well behaved flames with resPect to steadiness, laminarity, adiabaticity, one-dimensionality and flame thickness. Scaling and exPerimental considerations allowed for the identification of accePtable oPerating conditions in terms of Pressure and strain rate and yielded a synthetic rePresentation of a domain of diffusion flames of good quality. Such a graPh can inform the design of a high-Pressure counterflow system with resPect to the selection of burner geometry, diagnostic techniques and exPerimental conditions, allowing for the exPerimentalist to sidesteP costly and time consuming trial and error. Measurements by thin-filament Pyrometry and numerical simulations confirmed the ProPosed scaling.

Kim H Parker - One of the best experts on this subject based on the ideXlab platform.

  • the modified arterial reservoir an uPdate with consideration of asymPtotic Pressure P and zero flow Pressure Pzf
    Proceedings of the Institution of Mechanical Engineers. Part H Journal of engineering in medicine, 2020
    Co-Authors: Alun D Hughes, Kim H Parker
    Abstract:

    This article describes the modified arterial reservoir in detail. The modified arterial reservoir makes exPlicit the wave nature of both reservoir (Pres) and excess Pressure (Pxs). The mathematical...

  • The modified arterial reservoir: An uPdate with consideration of asymPtotic Pressure (P∞) and zero-flow Pressure (Pzf):
    Proceedings of the Institution of Mechanical Engineers. Part H Journal of engineering in medicine, 2020
    Co-Authors: Alun D Hughes, Kim H Parker
    Abstract:

    This article describes the modified arterial reservoir in detail. The modified arterial reservoir makes exPlicit the wave nature of both reservoir (Pres) and excess Pressure (Pxs). The mathematical...

  • the modified arterial reservoir an uPdate with consideration of asymPtotic Pressure P and zero flow Pressure Pzf
    medRxiv, 2020
    Co-Authors: Alun D Hughes, Kim H Parker
    Abstract:

    This article describes the modified arterial reservoir in detail. The modified arterial reservoir makes exPlicit the wave nature of both reservoir (Pres) and excess Pressure (Pxs). The mathematical derivation and methods for estimating Pres in the absence of flow velocity data are described. There is also discussion of zero-flow Pressure (Pzf), the Pressure at which flow through the circulation ceases; its relationshiP to asymPtotic Pressure (P∞) estimated by the reservoir model; and the Physiological interPretation of Pzf . A systematic review and meta-analysis Provides evidence that Pzf differs from mean circulatory filling Pressure.

  • The modified arterial reservoir: an uPdate with consideration of asymPtotic Pressure (P∞) and zero-flow Pressure (Pzf)
    medRxiv, 2020
    Co-Authors: Alun D Hughes, Kim H Parker
    Abstract:

    This article describes the modified arterial reservoir in detail. The modified arterial reservoir makes exPlicit the wave nature of both reservoir (Pres) and excess Pressure (Pxs). The mathematical derivation and methods for estimating Pres in the absence of flow velocity data are described. There is also discussion of zero-flow Pressure (Pzf), the Pressure at which flow through the circulation ceases; its relationshiP to asymPtotic Pressure (P∞) estimated by the reservoir model; and the Physiological interPretation of Pzf . A systematic review and meta-analysis Provides evidence that Pzf differs from mean circulatory filling Pressure.

  • SeParation of the reservoir and wave Pressure and velocity from measurements at an arbitrary location in arteries.
    Proceedings of the Institution of Mechanical Engineers. Part H Journal of engineering in medicine, 2008
    Co-Authors: Jazmin Aguado-sierra, Jordi Alastruey, J-j Wang, Nearchos Hadjiloizou, J.e. Davies, Kim H Parker
    Abstract:

    Previous studies based on measurements made in the ascending aorta have demonstrated that it can be useful to seParate the arterial Pressure P into a reservoir Pressure P generated by the windkessel effect and a wave Pressure P generated by the arterial waves: P=P + P. The seParation in these studies was relatively straightforward since the flow into the arterial system was measured. In this study the idea is extended to measurements of Pressure and velocity at sites distal to the aortic root where flow into the arterial system is not known. P is calculated from P at an arbitrary location in a large artery by fitting the Pressure fall-off in diastole to an exPonential function and assuming that P is ProPortional to the flow into the arterial system. A local reservoir velocity Ū that is ProPortional to P is also defined. The seParation algorithm is aPPlied to in vivo human and canine data and to numerical data generated using a one-dimensional model of Pulse wave ProPagation in the larger conduit arteries....

Tara J Fortin - One of the best experts on this subject based on the ideXlab platform.

  • thermodynamic ProPerties of 1 1 1 2 2 4 5 5 5 nonafluoro 4 trifluoromethyl 3 Pentanone vaPor Pressure P ρ t behavior and sPeed of sound measurements and an equation of state
    Journal of Chemical & Engineering Data, 2015
    Co-Authors: Mark O Mclinden, Richard A Perkins, Eric W Lemmon, Tara J Fortin
    Abstract:

    We rePort comPrehensive thermodynamic ProPerty measurements of 1,1,1,2,2,4,5,5,5-nonafluoro-4-(trifluoromethyl)-3-Pentanone. The (P, ρ, T) behavior was measured from T = (225 to 470) K with Pressures uP to 36 MPa with a two-sinker densimeter. These measurements include comPressed-liquid states and states in the extended critical region. The vaPor-Phase sPeed of sound was measured from T = (325 to 500) K with Pressures uP to 1.7 MPa with a sPherical acoustic resonator. The vaPor Pressure was measured in the sPherical resonator from T = (325 to 440) K with a static technique. The density and sPeed of sound of the liquid was measured from T = (278 to 308) K at atmosPheric Pressure (P = 83 kPa) in a benchtoP instrument emPloying a vibrating-U-tube densimeter and a time-of-flight sPeed-of-sound technique. These data, together with selected data from the fluid manufacturer, have been used to develoP an equation of state exPlicit in the Helmholtz energy covering the fluid region. The equation of state rePresents...

Mark O Mclinden - One of the best experts on this subject based on the ideXlab platform.

  • thermodynamic ProPerties of 1 1 1 2 2 4 5 5 5 nonafluoro 4 trifluoromethyl 3 Pentanone vaPor Pressure P ρ t behavior and sPeed of sound measurements and an equation of state
    Journal of Chemical & Engineering Data, 2015
    Co-Authors: Mark O Mclinden, Richard A Perkins, Eric W Lemmon, Tara J Fortin
    Abstract:

    We rePort comPrehensive thermodynamic ProPerty measurements of 1,1,1,2,2,4,5,5,5-nonafluoro-4-(trifluoromethyl)-3-Pentanone. The (P, ρ, T) behavior was measured from T = (225 to 470) K with Pressures uP to 36 MPa with a two-sinker densimeter. These measurements include comPressed-liquid states and states in the extended critical region. The vaPor-Phase sPeed of sound was measured from T = (325 to 500) K with Pressures uP to 1.7 MPa with a sPherical acoustic resonator. The vaPor Pressure was measured in the sPherical resonator from T = (325 to 440) K with a static technique. The density and sPeed of sound of the liquid was measured from T = (278 to 308) K at atmosPheric Pressure (P = 83 kPa) in a benchtoP instrument emPloying a vibrating-U-tube densimeter and a time-of-flight sPeed-of-sound technique. These data, together with selected data from the fluid manufacturer, have been used to develoP an equation of state exPlicit in the Helmholtz energy covering the fluid region. The equation of state rePresents...