Bell-Delaware method

It can be estimated mem accurately by using the Bell-Delaware method outlined in Example 14-6 or by using a computer software program. 

Calculate heat transfer coefficients and pressure drops using the Bell-Delaware Method [105] or the stream analysis method [106]. 

Bell-Delaware Method. Pressure drop and heat transfer calculations (the step 6 of the above thermal design procedure) constitute the key part of design. Tubeside calculations are straightforward and should be executed using available correlations for internal forced convection. The shellside calculations, however, must take into consideration the effect of various leakage streams (A and E streams in Fig. 17.30) and bypass streams (C and F streams in Fig. 17.30) in addition to the main crossflow stream B through the tube bundle. Several methods have been in use over the years, but the most accurate method in the open literature is the above mentioned Bell-Delaware method. This approach is based primarily on limited experimental data. The set of correlations discussed next constitutes the core of the Bell-Delaware method. 

TABLE 17.29 The Heat Transfer Coefficient on the Shell Side, Bell-Delaware Method... 

K. J. Bell, Delaware Method for Shell-Side Design, in Heat Transfer Equipment Design, R. K. Shah, E. C. Subbarao, and R. A. Mashelkar (eds.), pp. 145-166, Hemisphere, New York, 1988. 

The shell side flow path is more complex than that for tube hence, the calculation of shell side pressure drop is more difficult. More accurate calculation of shell side pressiue drop could be obtained by the Bell-Delaware method (Bell, 1973). For the... 

Bell (1960, 1963) developed a semi-analytical method based on work done in the cooperative research programme on shell and tube exchangers at the University of Delaware. His method accounts for the major bypass and leakage streams and is suitable for a manual calculation. Bell s method is outlined in Section 12.9.4 and illustrated in Example 12.3. 

Using Tinker s approach, BELL(12, i22) has described a semi-analytical method, based on work at the University of Delaware, which allows for the effects of major bypass and leakage streams, and which is suitable for use with calculators. In this procedure, the heat transfer coefficient and the pressure drop are obtained from correlations for flow over ideal tube banks, applying correction factors to allow for the effects of leakage, bypassing and flow... 

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