Temperature axial

The catalytic bed (70 cm ), supported by a metallic gauze, is located in the reforming section. Water is fed to the reactor at the bottom of the metallic gauze. The temperature inside the reactor is monitored by four thermocouples one (Tcomb) is located on the SiC foam and the other three (T ref L, T ref M, T ref H) are located at 25, 50 and 75%, respectively, of the catalytic bed height to provide the reactor temperature axial profile. Moreover, additional thermocouples monitor... 

A plot of the 2 magnetization (M /Moo) as a function of the irradiation resonance offset is given for an offset saturation experiment on a sample of degassed cyclohexane (CeHn) in CDCI3 at a temperature of 303 K. At this temperature, the cyclohexane resonance was noticeably narrow at 280 K, the linewidth of the cyclohexane resonance was approximately 1.2 Hz, compared to a width of 0.5 Hz for the internal TMS standard. From the resulting values of T and T2, and the measured low-temperature axial-equatorial chemical shift difference of 45.4 Hz at 100 MHz used in eq. (22), the rate at 293 K was determined to be 1.94 x 10 s Thus, rates on the order of 10 or 10 s are accessible in relatively simple systems using the offset-saturation method. 

The polystyrene simulation followed the experiments of Bell and Edie (12) with good agreement. Figure 14.8 shows the simulation results for fiber spinning nylon-6.6 with a draw ratio of 40. The figure demonstrates the wealth of information provided by the model. It shows the velocity, temperature, axial normal stress, and crystallinity fields along the threadline. We see the characteristic exponential-like drop in diameter with locally (radially) constant but accelerating velocity. However, results map out the temperature, stress, and crystallinity fields, which show marked variation radially and axially. 

Fig. 14.8 Simulation results for velocity, temperature, axial normal stress, and crystallinity fields for low-speed spinning of nylon-6.6. [Reprinted with permission from Joo et al., Two-dimensional Numerical Analysis of Nonisothermal Melt Spinning with and without Phase Transition, J. Non-Newt. Fluid Mech., 102, 37-70 (2002).]...

The axial stress approaches a value of 540 psi, far in excess of the high-temperature axial strength of 260 psi sec Table 8. Similarly, the tangential stress approaches 200 psi,... 

These flux estimates demonstrate the problem involved in estimating hydrothermal chemical fluxes. Chemical concentrations for hydro-thermal waters are known only for the high-temperature axial category, which by this estimate is only c. 0.05% of the hydrothermal flow. 

Selective silylation of alcohols.1 The reagent selectively silylates equatorial hydroxyl groups in quantitative yield within 4-10 hours at room temperature. Axial hydroxyl groups do not react under these conditions. 

It can be observed that N2O decomposes and consequently O2 is stoichiometrically produced, but both N2O and O2 outlet concentrations oscillate in a quite regular way after about one hour from the start and during about one day of run. Moreover, the average values of N2O and O2 outlet concentrations have been respectively increasing and decreasing in the first 800 minutes and stabilise The frequency of the oscillations of N2O outlet concentration is about 30 minutes, i e at least four order of magnitude greater than the residence time, while their maximum amplitude is about 100 ppm It is worthwhile to point out that the catalytic bed temperature axially measured is always constant in the whole experiment ( 0 1 C)... 

FIGURE 5.8 Fluidized Bed Methanation Concentration and Temperature Axial Profiles... 

Figure 3.30 Axial stress temperature-axial strain thermomechanical cycle at a programming temperature of 71 °C and pre-strain level of 30%. The subplot shows the three-step thermal mechanical cycle of a specimen confined by a steel liner (step 1 (pre-stressing) and step 2 (cooUng and unloading) represent programming and step 3 represents stress recovery). Source [42] Reproduced with permission from Elsevier...

Ti-6246 Room-temperature axial fatigue strength at 10 cycies... 

Heat treated bar room temperature, axial loacing, zero minimum... 

Figure 13.11 Temperature-axial location plot of a typical sodium heat pipe to explain the sonic limit...

The steady, full-elliptic, 2-D laminar CFD code presented in Sect. 3.1 was used in the simulations (for details see also [6]). An orthogonal staggered grid of 450 X 140 points (x and y, respectively) was suflhcient to give a grid independent solution for the 300 x 7 mm channel domain. Uniform inlet profiles were applied for temperature, axial velocity and species mass fractions. The interfacial energy boundary conditions were prescribed wall temperature profiles these profiles were polynomial curves fitted through the thermocouple measurements of the upper and lower walls. No-slip was applied for both velocity components at the walls (y = 0 and 7 mm), while zero-Neumann conditions were used at the outlet. 

An orthogonal staggered mesh of 24 x 200 points (in the x- and y-direction, respectively) over half the gas-phase domain with finer spacing near the catalytic walls yielded a grid-independent solution. Two-dimensional solid heat conduction was solved on a uniform grid of 20 x 200 points. Uniform inlet properties were used for temperature, axial velocity and species mass fractions. No-slip was applied for both velocity components at the gas-wall interface (y — b) and zero-Neumann conditions were set at the outlet (x — L) and the plane of symmetry (y = 0). 

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