The Experts below are selected from a list of 156543 Experts worldwide ranked by ideXlab platform
Tomasz Sobota - One of the best experts on this subject based on the ideXlab platform.
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measurement of transient Fluid temperature
International Journal of Thermal Sciences, 2015Co-Authors: Magdalena Jaremkiewicz, Dawid Taler, Tomasz SobotaAbstract:Abstract An inverse method to determine transient Fluid temperature with high accuracy is proposed. Thermometer housing is modelled as a solid cylinder. The temperature of the Fluid is determined based on a transient temperature Measured at the cylinder axis. To determine the temperature and heat flux on the surface of a cylinder a space marching method is used. Using the finite volume method, the heat balance equations are written for all control volumes into which the cylinder is divided. Then, the temperature in the control volume nodes is calculated sequentially, starting from the centre of the cylinder and then marching toward to its outer surface. The transient Fluid temperature is calculated from the energy balance equation written for the node located at the outer surface of the cylinder. The heat transfer coefficient on the cylinder surface is determined from the experimental correlation based on the Measured Fluid mass flow rate or Fluid velocity. Test calculations and experiments were carried out to validate the method. In the experimental study, the temperature of the superheated steam in the header was determined using three thermometers with different diameters: 7, 15 and 20 mm the mass flow rate of the steam flowing through the header was Measured. Transient steam temperature was calculated using the method presented in the paper and compared with the actual steam temperature, which is known for Measured pressure and enthalpy of the steam.
Margaret K Tivey - One of the best experts on this subject based on the ideXlab platform.
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the influence of hydrothermal Fluid composition and advection rates on black smoker chimney mineralogy insights from modeling transport and reaction
Geochimica et Cosmochimica Acta, 1995Co-Authors: Margaret K TiveyAbstract:Abstract A detailed study of black smoker chimneys was carried out by drawing together mineralogical observations and Measured Fluid compositions. The modeling technique, which establishes a link between vent Fluid chemistry and vent deposit mineralogy, is used to examine the influence of the physical environment on transport across short length scales (centimeters) which are subject to steep thermal ( ∼350°C) and chemical gradients, and to predict saturation states of minerals as functions of position within chimney walls. Owing to short length scales, steep gradients, and constancy of bounding Fluid compositions, concentration profiles are controlled by transport; the effect of reaction rates on profiles is assumed to be negligible. Precipitation at points within the chimney wall is thus kinetically controlled; local equilibrium does not apply, and precipitation must be suppressed when calculating distributions of species and saturation states of minerals. Model calculations are performed in a series of four steps. The first is speciation of Measured Fluid compositions at in situ temperature and pressure conditions. Results of calculations are plotted on stability diagrams of log fO2 - log f S2 and log fO2 - log [ (a Fe 2+ ) (a cu + ) 2 ] to examine how closely the predicted saturation states fit with observations of minerals coexisting with the hydrothermal Fluid at the vent sites. The second step is calculation of heat and mass transport across the chimney wall, the third is speciation of the pore Fluid compositions calculated to exist in the wall subsequent to transport, and the fourth is comparison of calculated mineral saturation states to observations of naturally occurring chimney samples. Application of the modeling technique to five vent sites which exhibit distinct Fluid compositions allows reproduction of observed mineralogy. Model results demonstrate the sensitivity of geochemical processes to the physical environment (porosity, tortuosity, permeability, mineral composition), to rates of advection of seawater inward or hydrothermal Fluid outward across chimney walls, and to endmember Fluid composition.
Linda Ruppert - One of the best experts on this subject based on the ideXlab platform.
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abstract 12344 mismatch between objectively Measured Fluid retention and symptoms in patients with heart failure
Circulation, 2017Co-Authors: Barbara Riegel, Victoria Vaughan Dickson, Marguerite Daus, Julia Hill, Foster Osei Baah, Megan Streur, Elliane Irani, Lisa D Rathman, Joyce Wald, Linda RuppertAbstract:Heart failure (HF) patients are frequently hospitalized because of symptoms of congestion. Fluid accumulation is a slow process and early symptoms are often unrecognized for reasons that are unclea...
Xianliang Lei - One of the best experts on this subject based on the ideXlab platform.
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effect of Fluid temperature on the frictional coefficient of supercritical pressure water flowing in adiabatic horizontal tubes
Experimental Thermal and Fluid Science, 2016Co-Authors: Qing Zhang, Weiqiang Zhang, Xianliang LeiAbstract:Abstract Based on the analysis on sensitivity of the frictional coefficient of supercritical pressure water to the Fluid temperature, the conflict of the variation trends of the frictional coefficient with the Fluid enthalpy obtained by different researchers was explained. It is shown that both concave curves and convex curves are reasonable for the variation trend of the frictional coefficient with the Fluid enthalpy. For the same case, the variation trend of the frictional coefficient with the Fluid enthalpy might change from concave curves to convex curves, or, from convex curves to concave curves, when the Fluid temperature in the calculation of frictional coefficient is changed by a value as little as only 0.5–1.0 °C. The maximum error in the Measured Fluid temperature is estimated to be large enough (larger than ±1.0 °C), and might be the main reason for completely different tendencies of the frictional coefficient obtained in different studies.
Magdalena Jaremkiewicz - One of the best experts on this subject based on the ideXlab platform.
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measurement of transient Fluid temperature
International Journal of Thermal Sciences, 2015Co-Authors: Magdalena Jaremkiewicz, Dawid Taler, Tomasz SobotaAbstract:Abstract An inverse method to determine transient Fluid temperature with high accuracy is proposed. Thermometer housing is modelled as a solid cylinder. The temperature of the Fluid is determined based on a transient temperature Measured at the cylinder axis. To determine the temperature and heat flux on the surface of a cylinder a space marching method is used. Using the finite volume method, the heat balance equations are written for all control volumes into which the cylinder is divided. Then, the temperature in the control volume nodes is calculated sequentially, starting from the centre of the cylinder and then marching toward to its outer surface. The transient Fluid temperature is calculated from the energy balance equation written for the node located at the outer surface of the cylinder. The heat transfer coefficient on the cylinder surface is determined from the experimental correlation based on the Measured Fluid mass flow rate or Fluid velocity. Test calculations and experiments were carried out to validate the method. In the experimental study, the temperature of the superheated steam in the header was determined using three thermometers with different diameters: 7, 15 and 20 mm the mass flow rate of the steam flowing through the header was Measured. Transient steam temperature was calculated using the method presented in the paper and compared with the actual steam temperature, which is known for Measured pressure and enthalpy of the steam.