Numerical Analysis of Mass Transfer from an Evaporating or Condensing Binary Solution Drop under High Mass Flux Condition

2001 ◽  
Vol 34 (8) ◽  
pp. 1056-1060
Author(s):  
IZUMI TANIGUCHI ◽  
JUNICHI NAKAMURA
1980 ◽  
Vol 13 (5) ◽  
pp. 354-360 ◽  
Author(s):  
AKIRA HIRATA ◽  
YOSHIZO SUZUKI

1969 ◽  
Vol 24 (11) ◽  
pp. 1655-1660 ◽  
Author(s):  
A.W. Nienow ◽  
R. Unahabhokha ◽  
J.W. Mullin

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3502
Author(s):  
Xiaojing Zhu ◽  
Ruizeng Zhang ◽  
Xiao Yu ◽  
Maoguo Cao ◽  
Yongxiang Ren

The effects of gravity on the heat transfer performance of supercritical CO2 flowing within a vertical tube with a diameter of 4.75 mm are numerically studied in this paper. The main objectives are to comprehensively investigate the action of gravity and buoyancy on the supercritical heat transfer. An effective numerical method, which employs a modified Shear Stress Transfer k-ω model (SST k-ω), is applied at various gravity conditions. It is found that, for both upward and downward flows, the heat transfer of supercritical CO2 is improved with increased gravity magnitude. The effect of gravity on heat transfer are more pronounced under a low mass flux condition than that under a high mass flux condition and it is closely related to the variations of thermal properties. For the upward flow, the increased gravity magnitude accelerates the near wall fluid and creates a classic “M-shaped” radial velocity distribution. For the downward flow, the increased gravity magnitude decelerates the near wall fluid and creates a parabola-like radial velocity distribution. On one hand, the turbulent kinetic energies of both the upward and downward flows are enhanced as the gravity magnitude increases, which benefits heat transfer dominated by turbulent eddy diffusion. On the other hand, high-density fluid with high thermal conductivity occupies the near wall region as the gravity magnitude increases, which benefits heat transfer dominated by molecular diffusion. The results might provide some instructive advice to improve the design and operation safety of heat exchanger at various gravity conditions.


2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Anum Shafiq ◽  
S. A. Lone ◽  
Tabassum Naz Sindhu ◽  
Q. M. Al-Mdallal ◽  
G. Rasool

AbstractThis article presents the implementation of a numerical solution of bioconvective nanofluid flow. The boundary layer flow (BLF) towards a vertical exponentially stretching plate with combination of heat and mass transfer rate in tangent hyperbolic nanofluid containing microorganisms. We have introduced zero mass flux condition to achieve physically realistic outcomes. Analysis is conducted with magnetic field phenomenon. By using similarity variables, the partial differential equation which governs the said model was converted into a nonlinear ordinary differential equation, and numerical results are achieved by applying the shooting technique. The paper describes and addresses all numerical outcomes, such as for the Skin friction coefficients (SFC), local density of motile microorganisams (LDMM) and the local number Nusselt (LNN). Furthermore, the effects of the buoyancy force number, bioconvection Lewis parameter, bioconvection Rayleigh number, bioconvection Pecelt parameter, thermophoresis and Brownian motion are discussed. The outcomes of the study ensure that the stretched surface has a unique solution: as Nr (Lb) and Rb (Pe) increase, the drag force (mass transfer rate) increases respectively. Furthermore, for least values of Nb and all the values of Nt under consideration the rate of heat transfer upsurges. The data of SFC, LNN, and LDMM have been tested utilizing various statistical models, and it is noted that data sets for SFC and LDMM fit the Weibull model for different values of Nr and Lb respectively. On the other hand, Frechet distribution fits well for LNN data set for various values of Nt.


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