Steady process

Steady power supply, i.e., steady process and constant heat history... 

Immediate Start to a Steady process of Adaptation while there is Still Time to do it Economically. 

Steady processes are ones that do not change with the passage of time. If denotes a property of the flowing fluid, for example the pressure or velocity, then for steady conditions... 

Fig. 8. The ratio of the drag force to the weight of an a-pinene droplet with initial diameter 29.8 /tm evaporating in nitrogen at 293 K. The solid line is the prediction based on Stokes law for the drag force on a sphere, assuming a quasi-steady process.

The issue of activity coefficient measurement for binary droplets was addressed by Allen et al. (1990). For low-vapor-pressure species, their diffusional fluxes in the gas phase are independent because of their low gas phase concentrations, and for a quasi-steady process each flux may be written... 

For a quasi-steady process, the mass flux is obtained from Eq. (97), for Jj = pidaldt, where pi is the droplet density. For Pa = 0 one obtains... 

In the case of combustion of a condensed substance, conservation of enthalpy and similarity occur only in the gas phase and only in part of the space. In the c-phase the diffusion coefficient is much smaller than the thermal diffusivity, and we have heating of the c-phase by heat conduction without dilution by diffusion. The enthalpy of the c-phase at the boundary, for x — 0 (from the side x < 0), is larger than the enthalpy of the c-phase far from the reaction zone and larger than the enthalpy of the combustion products. The advantage of the derivation given here is that the constancy of the enthalpy in the gas phase and its equality to H0 (H0 is the enthalpy of the c-phase far from the combustion zone, at x — —oo) are obtained without regard to the state of the intermediate layers of the c-phase. We should particularly emphasize that the constancy of the enthalpy in the combustion zone occurs only for a steady process. The presence of layers of the c-phase with increased enthalpy opens the possibility in a non-steady process of a temporary change in the enthalpy of the gas and the combustion temperature (on this see 5). 

A healthy diet has come along with many other changes in my life through a steady process of politicization, always connected with my vision of the world I want my kids to be able to grow up into. In our family our ideas about food are completely integrated with our politics and our spirituality. My dietary choices are not just concerned with the health... 

Resonance-like suppression of the higher harmonics in the response spectrum of a superparamagnetic particle is investigated. Using a nonperturbative approach, we analyze the steady processes that take place under arbitrary values of the DC (bias) and AC (excitation) strengths. The results show that the suppression effect is equally achieved on varying either noise (temperature) or force (external field intensity) or by a combination of both. In the fundamental aspect, we surmise... 

The applicability of Maxwell s equation is limited in describing particle growth or depletion by mass transfer. Strictly speaking, mass transfer to a small droplet cannot be a steady process because the radius changes, causing a change in the transfer rate. However, when the difference between vapor concentration far from the droplet and at the droplet surface is small, the transport rate given by Maxwell s equation holds at any instant. That is, the diffusional transport process proceeds as a quasi-stationary process. 

The above is confirmed by the solution of Eq. (4.9). Assuming that in the ground (initial) state there is only the population ap ], the solution for bPg at i r 1 (steady process) is obtained in the form of the expression presented in [133] ... 

In addition to the spatial model dimensions described above, time may be a key factor in the case of an unsteady processes, e.g., when starting up a screw. Co-rotating screws are generally operated continuously, however, so the focus of modeling is on steady processes. The development of a temperature field is described in Section 6.8 as an example of an unsteady starting process. 

Assume that the kinetic and potential energy effects are negligible, and this is a steady process. 

Estimate the energy expenditure for a steady process involving oxidation of 425 g/day glucose at 310 K and 1 atm. 

For the subcritical pressure range of interest, gas-phase heat and mass diffusion rates are of the order of 10 -1 cm /sec while the liquid-phase heat transfer rate is of the order of 10" cm /sec, and the liquid surface area regression rate is approximately 10" -10" ctn /sec. Inasmuch as the gas-phase transfer rates are much faster than all of the liquid-phase transfer rates, gas-phase heat and mass transfer can be represented as quasi-steady processes. The validity of this quasi-steady approximation has been substantiated by the numerical study of Hubbard et al. (10). Furthermore, Law and Sirignano (6) have demonstrated that effects caused by the hquid surface regression during the droplet heating period are negligible relative to the liquid-phase heat conduction rate. 

Most heat transfer problems encountered in practice are transient in nature, but they are usually analyzed under some presumed steady conditions since steady processes are easier to analyze, and they provide the answers to our questions. For example, heat transfer through the walls and ceiling of a typical house is never steady since the outdoor conditions such as the temperature, the speed and direction of the wind, the location of the sun, and so on, change constantly. The conditions in a typical house are not so steady either. Therefore, it is alinosl impossible to perform a heat transfer analysis of a house accurately. But then, do we really need an in-depth heat transfer analysis If the... 

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