Author details

F Constant of Eq. (33) G Constant of Eq. (33)

56 Heat Exchangers– Design, Experiment and Simulation

g Acceleration of gravity (m/s<sup>2</sup>

J Diameter of bank of tubes (m)

M Mass of fluid in the vessel (kg)

N Rotation of impeller (rpm)

K Constant of Eq. (16) K″ Constant of Eq. (8)

L Length of tube (m)

Nu Nusselt's number Pr Prandtl's number

k Thermal conductivity of fluid (W/m °C)

LMTD Logarithmic mean temperature difference (°C)

Nt Total number of tubular vertical baffles tubes

Q Heat transfer rate in control volume (W) Rc Thermal conduction resistance (m<sup>2</sup> °C/W) Rdi Internal resistance by fouling (m2 °C/W) Rd<sup>0</sup> External resistance by fouling (m<sup>2</sup> °C/W)

Re Reynolds number for inside tube

Tb Bulk temperature in vessel (°C) Tb<sup>1</sup> Inlet bulk temperature in vessel (°C) Tb<sup>2</sup> Outlet bulk temperature in vessel (°C)

T Mean temperature of hot fluid (°C)

u Velocity of fluid (m/s)

Rea Reynolds number for agitation in vessels

T Constant temperature of hot fluid in isothermal process (°C) T′ Constant temperature of cold fluid in isothermal process (°C) T<sup>1</sup> Inlet temperature of hot fluid in nonisothermal process (°C) T<sup>2</sup> Outlet temperature of hot fluid in nonisothermal process (°C)

U, Uc, Ud Overall heat transfer coefficient, clean coefficient, and design coefficient (W/m<sup>2</sup> °C)

Nb Number of bank tube of tubular vertical baffles tubes

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hio Heat transfer coefficient at the internal surface in relation of external surface (W/m2 °C)

h<sup>i</sup> Heat transfer coefficient at internal surface of tube (W/m<sup>2</sup> °C)

ho Heat transfer coefficient at the external surface

he Specific enthalpy of flow inlet in control volume (kJ/kg) hs Specific enthalpy of flow outlet in control volume (kJ/kg)

> Vitor da Silva Rosa\* and Deovaldo de Moraes Júnior

\*Address all correspondence to: victor@unisanta.br

Chemical Engineering Department, Santa Cecília University, Santos, São Paulo, Brazil
