Mass Transfer (Absorption) Coefficients Prediction from Data on Heat Transfer and Fluid Friction

Heat and mass transfer in the separated, reattached, and redeveloping regions of incompressible or compressible flow is very important in relation to many types of heat exchangers. There have been numerous works published describing these flows for a wide variety of geometric configurations, In the present article, a survey is made of published studies of heat transfer in the separated, reattached, and redeveloping regions of incompressible flow around or in a wide variety of flow configurations. Flow configurations cited in the article are the downward facing step, the sudden expansion plane channel, the abrupt expansion tube, the blunt flat plate, the longitudinal blunt circular cylinder, and the surface mounted obstacle. The laminar and turbulent flow cases using both experimental and numerical methodologies are reviewed. This review article includes 268 references.

Download Full-text

Impact of Binary Chemical Reaction and Activation Energy on Heat and Mass Transfer of Marangoni Driven Boundary Layer Flow of a Non-Newtonian Nanofluid

Processes ◽

10.3390/pr9040702 ◽

2021 ◽

Vol 9 (4) ◽

pp. 702

Author(s):

Ramanahalli Jayadevamurthy Punith Gowda ◽

Rangaswamy Naveen Kumar ◽

Anigere Marikempaiah Jyothi ◽

Ballajja Chandrappa Prasannakumara ◽

Ioannis E. Sarris

Keyword(s):

Heat Transfer ◽

Activation Energy ◽

Boundary Layer ◽

Mass Transfer ◽

Heat And Mass Transfer ◽

Velocity Gradient ◽

Boundary Layer Flow ◽

Biological Fluids ◽

Porosity Parameter ◽

Layer Flow

The flow and heat transfer of non-Newtonian nanofluids has an extensive range of applications in oceanography, the cooling of metallic plates, melt-spinning, the movement of biological fluids, heat exchangers technology, coating and suspensions. In view of these applications, we studied the steady Marangoni driven boundary layer flow, heat and mass transfer characteristics of a nanofluid. A non-Newtonian second-grade liquid model is used to deliberate the effect of activation energy on the chemically reactive non-Newtonian nanofluid. By applying suitable similarity transformations, the system of governing equations is transformed into a set of ordinary differential equations. These reduced equations are tackled numerically using the Runge–Kutta–Fehlberg fourth-fifth order (RKF-45) method. The velocity, concentration, thermal fields and rate of heat transfer are explored for the embedded non-dimensional parameters graphically. Our results revealed that the escalating values of the Marangoni number improve the velocity gradient and reduce the heat transfer. As the values of the porosity parameter increase, the velocity gradient is reduced and the heat transfer is improved. Finally, the Nusselt number is found to decline as the porosity parameter increases.

Download Full-text

CFD-based structure optimization of plate bundle in plate-fin heat exchanger considering flow and heat transfer performance

International Journal of Chemical Reactor Engineering ◽

10.1515/ijcre-2020-0219 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Yao Li ◽

Haiqing Si ◽

Jingxuan Qiu ◽

Yingying Shen ◽

Peihong Zhang ◽

...

Keyword(s):

Heat Transfer ◽

Mass Transfer ◽

Heat Exchanger ◽

Heat And Mass Transfer ◽

Field Performance ◽

High Specific Surface Area ◽

Calculation Model ◽

Air Separation ◽

Transfer Efficiency ◽

Heat Transfer Efficiency

Abstract The plate-fin heat exchanger has been widely applied in the field of air separation and aerospace due to its high specific surface area of heat transfer. However, the low heat transfer efficiency of its plate bundles has also attracted more attention. It is of great significance to optimize the structure of plate-fin heat exchanger to improve its heat transfer efficiency. The plate bundle was studied by combining numerical simulation with experiment. Firstly, according to the heat and mass transfer theory, the plate bundle calculation model of plate-fin heat exchanger was established, and the accuracy of the UDF (User-Defined Functions) for describing the mass and heat transfer was verified. Then, the influences of fin structure parameters on the heat and mass transfer characteristics of channel were discussed, including the height, spacing, thickness and length of fins. Finally the influence of various factors on the flow field performance under different flow states was integrated to complete the optimal design of the plate bundle.

Download Full-text

Heat and Mass Transfer in an Incompressible Turbulent Boundary Layer

Journal of Heat Transfer ◽

10.1115/1.3449865 ◽

1972 ◽

Vol 94 (1) ◽

pp. 23-28 ◽

Cited By ~ 2

Author(s):

E. Brundrett ◽

W. B. Nicoll ◽

A. B. Strong

Keyword(s):

Heat Transfer ◽

Boundary Layer ◽

Mass Transfer ◽

Porous Plate ◽

Mixing Length ◽

Two Dimensional ◽

Transfer Data ◽

Incompressible Turbulent Boundary Layer ◽

Wide Range ◽

Incompressible Boundary

The van Driest damped mixing length has been extended to account for the effects of mass transfer through a porous plate into a turbulent, two-dimensional incompressible boundary layer. The present mixing length is continuous from the wall through to the inner-law region of the flow, and although empirical, has been shown to predict wall shear stress and heat transfer data for a wide range of blowing rates.

Download Full-text