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PF wavy-fin DP

 

 

The procedure: 

 

Procedure CHX_DP_PF_strip_fin(TypeHX$, m_dot, A_fr_tot, b_2, L, Fluid$, T_i, T_o, P: DELTAp)

 

provides the pressure drop associated with a plain fin - strip fin compact heat exchanger surface.  These data are from Kays and London (1994).

 

Inputs

TypeHX$: string identifying the geometry 

 11.44-3/8W:  'PF_wavy-fin_1144_38W'

 11.5-3/8W: 'PF_wavy-fin_115_38W'

  17.8-3/8W: 'PF_wavy-fin_178_38W'

 

m_dot: mass flow rate (kg/s or lbm/hr)

A_fr_tot: total frontal area as viewed by the flow approaching the tube bank (m^2 or ft^2); note that this includes both the pin fin channels and the space occupied by the other channels

b_2: the width between adjacent pin fin channels occupied by the other channels (m or ft)

L: length of the heat exchanger (m or ft) in the flow direction

Fluid$: string indicating the fluid type

T_i: inlet temperature of the fluid (K, C, R, or F)

T_o: outlet temperature of the fluid (K, C, R, or F)

P: absolute pressure of the fluid (Pa, kPa, bar. MPa, atm, or psi)

 

Output

DP:  heat transfer coefficient (Pa, kPa, bar. MPa, atm, or psi)

 

Example

$UnitSystem SI Mass J K Pa

$VarInfo DELTAp units=Pa

TypeHX$= 'PF_wavy-fin_115_38W'

m_dot=0.7 [kg/s]

A_fr_tot=0.5 [m^2]

L=0.1 [m]

Fluid$='Air'

T=300 [K]

T_i=300 [K]

T_o=300 [K]

P=101325 [Pa]

b_2=0.01 [m]

Call chx_dp_pf_wavy_fin(TypeHX$, m_dot, A_fr_tot, b_2, L, Fluid$, T_i, T_o, P: DELTAp)

 

{Solution:

DELTAp = 73.4 [Pa]}

 

Related procedures include:

Geometry Functions

Nondimensional functions

Heat transfer coefficient