Effective terms thermal capacity

This step is one of the most difficult and is, of course, extremely important because all pertinent variables have to be included in the analysis. The term variable includes any physical quantity, dimensional and apparently non-dimensional constant that plays a role in the phenomenon under investigation. The determination of the variables must take into account practical knoivledge of the problem as ivell as the physical laivs governing the phenomenon. Variables typically include the parameters that are necessary not only to describe the geometry of the system (such as the diameter of the pipe in the example beloiv), but also to define the fluid properties (such as the density, viscosity, thermal capacity, thermal conductivity of the fluid, the diffusion coefficient for one species in the working fluid, etc.) as well as to indicate the external effects that influence the system (such as the driving pressure drop in the further discussed cases). 

Effective Thermal Capacity Term The effective thermal capacity term, +(l-0, can... 

The Ft correction factor is usually correlated in terms of two dimensionless ratios, the ratio of the two heat capacity flow rates R and the thermal effectiveness P of the exchanger ... 

In this expression, r and ro are, respectively, the instantaneous and equilibrium (i.e., when no sound field is acting on the liquid) values of the bubble radius and f and r represent, respectively, the first and second order time derivatives of the instantaneous bubble radius p is the liquid density y is the polytropic exponent of the gas inside the bubble (i.e., the ratio of heat capacities, Cp/Cv) Pa is the acoustic pressure amplitude Poo is the hydrostatic (ambient) pressure b is the bubble pulsation damping term that accounts for thermal, viscous, and radiation effects cr is the liquid surface tension t is time and coj. is the resonance frequency of the bubble, which is defined by the equation below ... 

Calibration is a potentially complex subject as there can be cell asymmetries in terms of heat capacity, thermal resistances, and other effects such as convection and emissivity. However, here we shall confine ourselves to a simple procedure that will be effective in most cases. We can consider that calibration of an MTDSC consists of three steps (1) heat flow calibration (by calculation of a cell constant), (2) baseline calibration, and (3) heat capacity calibration (10). 

---