Temperature profiles in heat exchangers

Figure 8.3. Temperature profiles in heat exchangers, (a) In parallel or countercurrent flow, with one or two phases, (b) One shell pass, two tube passes, (c) Two shell passes, four tube passes.

FIG. 11-1 Temperature profiles in heat exchangers, (a) Countercurrent, (b) Cocurrent. 

Figure 4.17. Temperature profiles for heat exchangers operated in cocurrent and countercurrent modes.

Typical temperature profiles of heat exchangers are shown schematically in Figure 3.3.2. 

Fig. 2. Fluid temperature profiles in (a) a parallel flow heat exchanger and (b) a counterflow heat exchanger. Terms are defined in text.

From Tolmin s theory and experimental data (e.g., Reichardtthe relationship between velocity profile and temperature profile in the jet cross-section can be expressed using an overall turbulent Prandtl number Pr = v /a, where Vf is a turbulent momentum exchange coefficient and a, is a turbulent heat exchange coefficient ... 

In Fig. 9.6 the temperature profiles in a counterflow heat exchanger are shown when C/, >. ... 

Figure 2.31 Characteristic temperature profiles in a counter-current micro heat exchanger for a very low (left), intermediate (middle) and very high (right) thermal conductivity of the wall material and equal volume flows inside the two channels, reproduced from [125],...

Figure 17.23. Representative temperature profiles in reaction systems (see also Figs. 17.20, 17.21(d), 17.22(d), 17.30(c), 17.34, and 17.35). (a) A jacketed tubular reactor, (b) Burner and reactor for high temperature pyrolysis of hydrocarbons (Ullmann, 1973, Vol. 3, p. 355) (c) A catalytic reactor system in which the feed is preheated to starting temperature and product is properly adjusted exo- and endothermic profiles, (d) Reactor with built-in heat exchange between feed and product and with external temperature adjustment exo- and endothermic profiles.

Fig. 10.8 The simulated temperature profiles in the cell and at the electrolyte for standard case ( 1) in Table 10.2 without considering the radiant heat exchange.

Fig. 4.5 Temperature profiles in subcritical (i>i), critical ( 2), and supercritical (< 3) conditions of heat exchange...

Figure 7 Temperature profiles in the main heat exchanger of the CEA sulphur section...

Different flow regimes and associated temperature profiles in a double-pipe heat exchanger. 

Equation (4-95) provides efficient rationalization of the cooling fluid s temperature profile in the limit as /c 0 at constant /Joutside- This corresponds to pure heat exchange between the cooling fluid and the surroundings when the inner pipe does not exist. Hence, (4-95) reduces to ... 

The shap>e of the temperature profile in a flat slab having the following characteristics, thickness 2b and thermal conductivity k, and conditions, initial temperature Tj, suddenly exposed to a cooling medium at temperature To and draining heat from the slab with a heat exchange coefficient h it is determined by the dimentionless Biot number ... 

Pin-promoters of the type shown in Fig. 3.2a and 3.2b are used in heat exchangers to enhance heat transfer by promoting local wall turbulence and by extending heat transfer area. Find an e q)ression to compute the temperature profile, assuming temperature varies mainly in the x direction. The plate temperature T, fluid temperature T , and heat transfer coefficient h are constant. 

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