Two-Phase Flow Heat Exchangers: Thermal-Hydraulic by F. Mayinger (auth.), Sadik Kakaç, Arthur E. Bergles, E.

By F. Mayinger (auth.), Sadik Kakaç, Arthur E. Bergles, E. Oliveira Fernandes (eds.)

Two-phase move warmth exchangers are very important elements of structures for strength iteration, chemical processing, and thermal atmosphere regulate. The artwork and technology of the layout of such warmth exchangers have complicated significantly lately. this can be as a result of greater realizing of the basics of two-phase circulate and warmth move in uncomplicated geometries, larger appreciation of those tactics in advanced goemetries, and better predictive power via use of advanced laptop codes. the topic is obviously of serious basic and functional significance. The NATO ASIan Thermal-Hydraulic basics and layout of Two-Phase circulate warmth Exchangers was once held in Povoa de Varzim (near Porto), Portugal, July 6-17, 1987. engaging within the association of" the ASI have been the dep. of Mechanical Engineering and the fresh power examine Institute, college of Miami; Universidade do Porto; and the dep. of Mechanical Engineering, Aeronautical Eng ineer ing, and Mechanics, Rensselaer Polytechnic Institute. The ASI used to be prepared essentially as a high-level instructing task by means of specialists representing either educational and business viewpoints. this system integrated the presentation of invited lectures, a constrained variety of comparable technical papers and dialogue sessions.

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Extra info for Two-Phase Flow Heat Exchangers: Thermal-Hydraulic Fundamentals and Design

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As shown in Table 2, the E -NTU relations are different depending upon whether the tube fluid is the Cmax or Cmin fluid in the shell-and-tube type heat exchangers. In order to avoid possible confusion about which is the Cmin fluid, P is defined· as the temperature effectiveness of the heat exchanger on one fluid side, regardless of whether i t is the hot side or the cold side. NTU is based on that side's heat capacity rate and R is defined as a ratio of that side's heat capacity rate to that of the other side.

IC max ) exp [-NTU (1 - Cm1n . IC max )] (46) If C < Ch (C c = C . , Ch = C ), the result will be the same. m1n max c In the case of parallel flow, a similar analysis may be applied to obtain the following expression e: = 1 - exp [-NTU (1 + C . IC )] m1n max 1 + C . IC m1n max (47) Two limiting cases are of interest: CmiriCmax equal to unity or zero: For CIDin/Gnax = I, Eq. (46) is indeterminate, but by applying L'Hospital's rule to Eq. (46), the following result is obtained: For (C . IC ) m1n max 1 Counterflow: (48) Parallel flow, Eq.

In this method, a new grouping Wis introduced. 7 ~o I ~ ~ ......... 4 \I a.. 8 I 2 NTU c Figure 16. The temperature effectiveness P as a function of NTU c and R for 1-2 shell-and-tube heat exchanger with shell fluid mixed. The LMTD correction factors F are superimposed to tie with the LMI'D method [9 J . (57) It can be shown that Wis related to € and NTU as (58) The log-mean temperature difference correction factor is defined as (see Eqs.

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