| do |
|
(Outside diameter of inner tube , in) |
Di |
|
(Inside diameter of Outer tube , in) |
L |
|
(Tube length , ft) |
| VISC |
|
(Viscosity, lb per ft per hr) |
| W |
|
(mass flow rate, lb per hr) |
| rho |
|
(Density, lb per ft3) |
| k |
|
(Thermal conductivity, BTU per hr per ft per deg F) |
| C |
|
(heat capacity, BTU per lb per deg F) |
| visc_w |
|
(Viscosity at wall temperature, lb per ft per hr) |
phi |
|
(Viscosity correction factor) |
| Tb |
|
(Tube side fluid bulk temperature, deg F) |
| tw |
|
(Wall temperature, deg F) |
| T1 |
|
(Inlet temperature of Hot fluid, deg F) |
| T2 |
|
(Outlet temperature of cold fluid, deg F) |
| beta |
|
(coefficient of thermal expansion, per deg R) |