Heat transfer coefficient salt bath temperature effect

Maintenance of isothermal conditions requires special care. Temperature differences should be minimised and heat-transfer coefficients and surface areas maximized. Electric heaters, steam jackets, or molten salt baths are often used for such purposes. Separate heating or cooling circuits and controls are used with inlet and oudet lines to minimize end effects. Pressure or thermal transients can result in longer Hved transients in the individual catalyst pellets, because concentration and temperature gradients within catalyst pores adjust slowly. 

Apart from the important effect of mass velocity, summarised in Table II, the particle size and, to a greater extent, the particle shape were also found to be important. The salt bath temperature gave an effect on U which could not be explained by the induced changes in the conductivity and viscosity of air alone. Particle conductivity and tube diameter, within their range of variation, have only marginal effects on the overall heat transfer coefficient. 

Figure 5. Effect of salt bath temperature on overall heat transfer coefficient. Key ------------------, without radiation O,

Fig The effect of salt bath temperature on the overall heat transfer coefficient [i ]. Reprinted with permission ACS Symp. Series 196, 527. Copyright (1982) ACS. 

---

See also in sourсe #XX -- [ ]

---