The average relative deviations (ARD%) of critical temperature T c, critical pressure p c and critical density ρ c between the calculated results and the experimental data for 16 systems are 0 44%, 1 31% and 1 01%, respectively.
According to the classical cavitation theory, the critical pressure for teginning cavitation is vapour pressure of water, and the cavitation inception number is calculated with the formula (σ_i=P_■-P_v/1/2PV_(■)~2).
The simulation reservoir fluid phase diagram constructed by using PVTsim10.0 software indicates that for this unsaturated reservoir a monophase reservoir fluid flow will occur under the reservoir pressure and the reservoir fluid has critical temperature 331.6℃ and critical pressure 7.66 MPa.
In this paper, the general equation of critical conditions of elastic torsional-fl exural buckling of beam-columns is obtained by Rayleigh-Ritz method but the expression of critical load is obtained by critical moment rather than critical compression force which is different from the traditional way.
The article establishes, by means of thermodynamics,the functions of temperature and pressure in the equlibrium state while calcite,dolomite and siderite react on liquid water containing gas CO_2. Their highest critical temperatures are 266K and 264K and 261K and their lowest critical pressures 86. 5MPa,106. 8MPa and 133. 7MPa respectively.
At sub-critical and near critical pressures, the boiling heat transfer characteristics of water in the inclined upward smooth tube of the inclined angle of α=20° and the vertical upward smooth tube with the diameter of Φ32×3mm were researched experimentally.
The critical compressive force of drill stem compressed in horizontal well is analyzed and calculated in this paper,and the calculation formula of critical compressive force of drill stem in horizontal well is deduced.
In this paper, the critical load of horizontal drill stem is analyzed and calculated on the basis of considering this factor, and the new calculation method of critical compressive force of horizontal drill stem is proposed.
In this paper the horizontal drill stem being looked upon as compressed rod in axis hinged in both side and situated at elastic support,the critical compressive load of horizontal drill stem is analyzed and calculated by static force balance method,and the formula calculating the critical compressive force is derived.
Based on the experiments, it was found that heat transfer enhancement of the internally ribbed tube could postpone departure from nucleate boiling at the sub-critical pressure.
However, the heat transfer enhancement decreased near the critical pressure.
At supercritical pressure, the temperature difference between the wall and the fluid increased near the pseudo-critical temperature, but the increase of wall temperature was less than that of departure from nucleate boiling at sub-critical pressure.
When pressure is closer to the critical pressure, the temperature difference between the wall and the fluid increased greatly near the pseudo-critical temperature.
As ΔPincreases, an advancing meniscus forms contact angle of 50°-60° due to the film rupture when it reaches critical pressure in the thinnest part near the meniscus.
Analysis of a Communication Network Governed by an Adaptive Random Multiple Access Protocol in Critical Load
The value of the network critical load is found; in the critical load, asymptotic probability distributions for states of the information transmission channel and for the number of requests in the source of repeated calls are found.
Acidic soil, large deposits of sulfur pollutants in relation to the critical load, the presence of soot and soluble salt, and conditions giving access to water and air were found to accelerate the deterioration.
Physical, mechanical, and tribological characteristics of coatings were comparatively analyzed, including determination of the hardness, elastic modulus, elastic recovery, critical load, friction coefficient, and wear rate.
The resulting asymptotic solution can be used readily to perform the analysis of parameters and predict the buckling critical load.