Velocity and concentration measurements in a model diesel engine

Arcoumanis, C.; Green, H. G.; Whitelaw, J. H.

doi:10.1007/bf00281773

Cited by 19 publications

(1 citation statement)

References 8 publications

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“…The evolution of the parameter n as a function of temperature is employed to evaluate the conduction mechanism. The physical significance of the parameter n numerical values has been explained by Funke et al 99 For n > 1, conduction through the lattice is due to the Maxwell–Wagner (M-W) mechanism, while at n ≤ 1, it is attributed to the correlated barrier jump (CBH) mechanism. The exponent value ( n ) is between 0 and 1.…”

Section: Resultsmentioning

confidence: 99%

Studies of Structural, Dielectric, and Impedance Spectroscopy of KBT-Modified Sodium Bismuth Titanate Lead-Free Ceramics

et al. 2022

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Lead-free ceramic materials produced from bismuth sodium titanate (Na0.5Bi0.5TiO3, NBT)–bismuth potassium titanate (K0.5Bi0.5TiO3, KBT) have been developed through a solid-state reaction technique. The structural, dielectric, and piezoelectric characteristics of the ceramic materials were analyzed. Based on the XRD investigation, the morphotropic phase boundary (MPB) was determined for the composition (x (%) = 16 and 20). The effects of the KBT phase on the NBT lattice were examined using the charge density distribution. Furthermore, the dielectric properties indicated the presence of a negative dielectric constant (εr′) as a function of frequency between 1 kHz and 2 MHz. Negative permittivity was observed globally in the (1 – x)NBT–xKBT ceramic which reflects the effect of the dielectric resonance. The grain conduction effect is revealed through the complex impedance spectrum in the form of a semicircular arc within the Nyquist plot. In addition, the samples studied revealed a non-Debye relaxation phenomenon. The relaxation time was determined based on the Vogel-Fulcher law for all samples. DC conductivity was carried out on the ceramics material and revealed that the resistance decreases with increasing temperature indicating a negative temperature coefficient of resistance. The AC conductivity as a function of frequency for different temperatures suggests the presence of a thermally activated conduction mechanism. The activation energy has been determined based on the Arrhenius plot of the DC electrical conductivity as well as the relaxation frequency.

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Section: Resultsmentioning

confidence: 99%

Studies of Structural, Dielectric, and Impedance Spectroscopy of KBT-Modified Sodium Bismuth Titanate Lead-Free Ceramics

et al. 2022

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Application of Laser Anemometry and Rayleigh Scattering to Engine Flows

Arcoumanis

1989

Instrumentation for Combustion and Flow in Engines

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Measurement of tip penetration of confined high-density transient jets by laser beam deflection

Arcoumanis

Cossali

Whitelaw

1988

Experiments in Fluids

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The penetration of high density transient jets injected into a quiescent chamber containing air at atmospheric temperature and various pressures has been measured in terms of laser beam deflection. The sensitivity of the technique is quantified and the rate of jet penetration shown to increase with jet to chamber density ratio, decrease with chamber pressure and vary with downstream distance from the nozzle.

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Velocity and concentration measurements in a model diesel engine

Cited by 19 publications

References 8 publications

Studies of Structural, Dielectric, and Impedance Spectroscopy of KBT-Modified Sodium Bismuth Titanate Lead-Free Ceramics

Studies of Structural, Dielectric, and Impedance Spectroscopy of KBT-Modified Sodium Bismuth Titanate Lead-Free Ceramics

Application of Laser Anemometry and Rayleigh Scattering to Engine Flows

Measurement of tip penetration of confined high-density transient jets by laser beam deflection

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