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Arabian Journal for Science and Engineering

, Volume 43, Issue 9, pp 4991–5001 | Cite as

Heat and Mass Transfer Enhancement for Falling Film Absorption Process in Vertical Plate Absorber by Adding Copper Nanoparticles

  • Mohamed Bechir Ben Hamida
  • Jalel Belghaieb
  • Nejib Hajji
Research Article - Mechanical Engineering

Abstract

This paper examined the effect of nanoparticles on the absorption of vapor into a liquid film of lithium bromide aqueous solution flowing down over a cooled vertical channel. For this, we realized a two-dimensional code which solves the governing equations using Comsol Multiphysics. In this model, the cooling water flows countercurrent to a solution of concentrated lithium bromide mixed with the copper nanoparticles. After the validation of the model, the effects of parameters such as Reynolds number, solid volume fraction of copper nanoparticles, inlet concentration and inlet temperature of solution on the performance of the absorption are presented and discussed. The important results indicate that the mass and heat transfer in binary nanofluids are enhanced more than that in base fluid and the efficiency of the nanofluid becomes higher to that of the base fluid for a lower Reynolds number and the inlet concentration and for a higher inlet temperature of solution.

Keywords

Heat transfer Mass transfer Enhancement Absorption process Falling film Water-Lithium bromide Copper nanoparticles Comsol Multiphysics 

List of Symbols

C

Mass concentration, wt% LiBr

D

Diffusion coefficient, \(\hbox {m}^{2}/\hbox {s}\)

Cp

Specific heat at constant pressure, kJ/kg K

g

Gravitational acceleration, \(\hbox {m/s}^{2}\)

\(H_\mathrm{abs}\)

Enthalpy of absorption, J/Kg

\(\hbox {H}_{2}\hbox {O}\)

Water

h

Enthalpy, J/Kg

k

Thermal conductivity, W/m K

L

Length of plate, m

\(M_{\mathrm{surf}}\)

Total mass transfer rate absorbed kg/m.s

\(m_{\mathrm{surf}}\)

Absorption mass flux, \(\hbox {kg/m}^{2}\).s

Nu

Nusselt number

Q

Heat transfer rate, kW

\(R_{\mathrm{eff,abs}}\)

Effective absorption ratio

Re

Reynold’s number

T

Temperature, K

P

Pressure, Pa

u

Velocity in x-direction, \(\hbox {m s}^{-1}\)

v

Velocity in y-direction, \(\hbox {m s}^{-1}\)

x

Coordinate in direction perpendicular to flow, m

y

Coordinate in direction of flow, m

Greek symbols

\(\phi \)

Solid volume fraction of nanoparticles

\(\delta \)

Liquid film thickness, m

\(\mu \)

Dynamic viscosity, kg/m s

\(\rho \)

Density, \(\hbox {kg/m}^{3}\)

\(\Gamma \)

Liquid mass flow rate per unit width, kg/m.s

Subscripts

abs

Absorption process

bulk

Bulk solution

c

Cooling water

f

Fluid

in

Inlet

nf

Binary nanofluid

out

Outlet

p

Nanoparticles

surf

Interface

W

Wall

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Copyright information

© King Fahd University of Petroleum & Minerals 2018

Authors and Affiliations

  • Mohamed Bechir Ben Hamida
    • 1
  • Jalel Belghaieb
    • 2
    • 3
  • Nejib Hajji
    • 2
    • 3
  1. 1.Department of Physics, High School of Sciences and Technology of Hammam Sousse (ESSTHS)University of SousseSousseTunisia
  2. 2.Department of Process Engineering, National School of Engineers of Gabes (ENIG)University of GabesGabesTunisia
  3. 3.Research Unit of Energy and Environment Ionized, National School of Engineers of Gabes (ENIG)University of GabesGabesTunisia

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