Temperature cold liquid profiles

Henry and Fauske (1975, 1976) have proposed a model to describe the events leading to a large-scale vapor explosion in a free contact mode. Their initial, necessary conditions are that the two liquids, one hot and the other cold, must come into intimate contact, and the interfacial temperature [Eq. (1)] must be greater than the homogeneous nucleation temperature of the colder liquid. Assuming the properties of both liquids are not strong functions of temperature, the interface temperature is then invariant with time. Temperature profiles within the cold liquid may then be computed (Eckert and Drake, 1972) as... 

The temperature and liquid phase composition profiles for this final case are shown in Fig. 13-42. The temperature increases from top to bottom of the column. This is normally the case in distillation columns (exceptions may occur with cold feeds or feeds with boiling points significantly lower than that of the mixture on stages above the feed stage). The composition profiles also are as expected. The components more volatile than the light key (fvbutane) are... 

Let s start by recalling the driving force for heat transfer across an interface. Suppose 1 contact a hot gas with a cold liquid. The temperature profile near the interface will look something like that show at right. There are two characteristics of this sketch which are important ... 

A cold liquid film, initially at temperature Tg, is falling down (in z-direction) a vertical solid wall (xz-plane). The solid wall is maintained at a temperature T ) higher than that of the falling film. Tt is desired to know the temperature profile of the fluid as a function of y and z, near the wall. The partial differential equation that describes the temperature of the liquid for this problem is... 

It is also possible to use a single thermocouple at different positions in multiple mns. This requires careful control of autoclave temperature to reduce error caused by run-to-mn variation. Repeat studies are required to establish reproducible cold points and temperature profiles of the liquid in the container. The profile point having the lowest temperature or lowest Fq is designated as the cold spot. 

Both the absorber and stripper are columns in which commercial high surface area structured packing material, currently Sulzer DX, is installed. The cold rich stream from the absorber and the hot lean solvent from the stripper or MGD module are heat exchanged. Temperature profiles along the absorber and stripper can be measured. In total 7 pressure, 19 temperature, 5 gas flow, 2 liquid flow and 2 sump sensors are installed and logged. Samples can be... 

In most situations involving a liquid or a gas in heat transfer, convective heat transfer usually occurs as well as conduction. In most industrial processes where heat transfer is occurring, heat is being transformed from one fluid through a solid wall to a second fluid. In Fig. 4.5-1 heat is being transferred from the hot flowing fluid to the cold flowing fluid. The temperature profile is shown. 

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