scholarly journals Improving eco-sustainable characteristics and energy efficiency of evaporative fluid cooler via experimental and numerical study

2008 ◽  
Vol 12 (4) ◽  
pp. 89-103 ◽  
Author(s):  
Predrag Raskovic ◽  
Goran Vuckovic ◽  
Mica Vukic
Keyword(s):  
Mathematical Model ◽  
Experimental Study ◽  
Numerical Study ◽  
Simulation Software ◽  
Process Industry ◽  
Small Scale ◽  
Experimental Measurements ◽  
New Approach ◽  
Transfer Processes ◽  
Mass Transfer Processes

This paper presents an on-going research project that aims to identify possibilities for wider use of evaporative cooling in process industry, especially the use of evaporative fluid cooler units. Experimental study is performed on small scale evaporative fluid cooler, while the correlation based model has been carried out to explore the detailed heat and mass transfer processes inside this unit. Numerical integration of mathematical model is executed by new approach, based on differential, collocation Simpson method. Proposed models have been verified by comparing the computed results with those obtained by the experimental measurements. The results of research will enable the creation of more comprehensive simulation software, with wider range of operating and construction parameters.

scholarly journals Optimization of heat and mass transfer processes in air conditioning systems in public buildings

2020 ◽  
Vol 4 (4) ◽  
pp. 49-56
Author(s):  
A. V. Tsygankov ◽  
◽  
V. I. Lysev ◽  
A. K. Rubtsov ◽  
A. S. Shilin ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Experimental Study ◽  
Air Conditioning ◽  
Heat Fluxes ◽  
Public Buildings ◽  
Transfer Processes ◽  
Air Temperatures ◽  
Mass Transfer Processes ◽  
Predicted Values ◽  
Air Conditioning Systems

Increasing the energy efficiency of air conditioning systems in public buildings and structures is an actual task. A mathematical model is proposed for determining the values of internal air temperatures and temperatures of the surfaces of enclosure in order to calculate the predicted values of heat fluxes in buildings and structures. An experimental study has been carried out showing the relevance of the proposed method

Physical and Mathematical Model and Method for Computing Heat and Mass Transfer Processes in the System of a Stratum Featuring Horizontal Well

2021 ◽  
pp. 133-149
Author(s):  
I.N. Zhizhimontov ◽  
A.B. Shabarov
Keyword(s):  
Mathematical Model ◽  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Numerical Study ◽  
Horizontal Wells ◽  
High Viscosity ◽  
Transfer Processes ◽  
Mass Transfer Processes ◽  
Thermophysical Model ◽  
High Viscosity Oil

In order to solve scientific and engineering problems arising during analysis and development of hard-to-recover hydrocarbon reserves in high-viscosity oil deposits, we performed a numerical study of heat and mass transfer processes in a mixture of water and oil. We achieved these goals by developing a hydrodynamic and thermophysical model of non-steady-state quasi-three-dimensional heat and mass transfer in a stratum featuring a system of horizontal wells. We propose an analytical approach to plotting a dynamic computational grid in a natural semi-fixed coordinate system. We compute streamlines and equipotential lines using the analytical solution proposed, which is based on complex analysis. The object of our investigation is natural strata saturatedby a multiphase fluid. We used the physical and mathematical model and the calculation method proposed to develop a software package and conduct a series of numerical and parametric studies concerning the effects caused by thermophysical properties of rocks and fluids combined with various operation modes in a system of horizontal wells. The paper describes how these parameters affect the rate of oil production in a real high-viscosity oil deposit. We verified the results obtained against actual core sample investigation data and technological parameters of oil deposit development, and further compared them to known analytical solutions and commercial hydrodynamic simulators

Rotational Compliance Measurements of a Flexible Plane Structure Using an Attached Beam-like Tip, Part 2: Experimental Study

1997 ◽  
Vol 119 (4) ◽  
pp. 603-608 ◽  
Author(s):  
Y. C. Qu ◽  
L. Cheng ◽  
D. Rancourt
Keyword(s):  
Experimental Study ◽  
Error Analysis ◽  
Numerical Simulations ◽  
Numerical Study ◽  
Companion Paper ◽  
Experimental Measurements ◽  
Frequency Range ◽  
Experimental Assessment ◽  
Different Types ◽  
Modal Behavior

This paper presents an experimental assessment of the Tip Excitation Technique (TET) introduced in a companion paper. The aim of the technique is to measure the rotational compliance of attached plane structures. Following the guidelines established on the basis of a numerical study in the companion paper, experimental measurements were performed on a rectangular plate and results were compared with numerical simulations. The investigation focuses on the general performance of the technique, on the different types of excitation used and on other factors necessary to ensure accurate results. In addition, an error analysis is conducted to demonstrate the sensitivity of the results to biased measurement quantities. It is concluded that the proposed technique can be used in the low to middle frequency range, where relatively strong modal behavior is involved.

scholarly journals Mathematical modelingof heat and mass transfer processes in the adsorbers of the air purification system

2021 ◽  
Vol 12 (2) ◽  
pp. 2719-2724
Author(s):  
E.I. Starovoitov, Et. al.
Keyword(s):  
Mathematical Model ◽  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Air Purification ◽  
Physical Processes ◽  
Transfer Processes ◽  
System A ◽  
Mass Transfer Processes ◽  
Purification System ◽  
Adsorption Cycle

The present work is devoted to the study of the processes of heat and mass transfer in the adsorbers of the preliminary drying unit of the atmosphere purification system. A mathematical model has been developed that adequately reflects the physical processes at all stages of the adsorption cycle.Algorithms for solving problems and programs for calculating heat and mass transfer processes in an adsorption regenerated installation are obtained, results of parametric calculations of heat and mass transfer processes at each stage of the adsorption cycle and for the entire cycle as a whole are obtained.

scholarly journals The Mathematical Model and Numerical Study of Heat and Mass Transfer Processes in the Combustion Chamber of Diesel-Generator Units with a Valve-Inductor Generator

2020 ◽  
pp. 611-625
Author(s):  
Dmitriy V. Guzei ◽  
Andrey V. Minakov ◽  
Vasiliy I. Panteleev ◽  
Maksim I. Pryazhnikov ◽  
Dmitriy V. Platonov ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Mass Transfer ◽  
Combustion Chamber ◽  
Heat And Mass Transfer ◽  
Operating Conditions ◽  
Diesel Generator ◽  
Transfer Processes ◽  
Mass Transfer Processes ◽  
Actual Geometry ◽  
The Mathematical Model

The mathematical model of heat and mass transfer processes in the combustion chamber of diesel generator units with valve inductor generators has been developed. The mathematical model takes into account the actual geometry of the combustion chamber and the operating conditions of the diesel engine. A study of the main characteristics of a diesel generator in a wide range of modes of operation has been carried out. In addition to energy characteristics, environmental parameters have been considered

scholarly journals Wave approach for modeling pressure swing adsorption

2018 ◽  
Vol 54 (3) ◽  
pp. 35-41 ◽  
Author(s):  
M.B. Kravchenko
Keyword(s):  
Mass Transfer ◽  
Working Conditions ◽  
Pressure Swing Adsorption ◽  
Wave Method ◽  
Efficient Operation ◽  
New Approach ◽  
Transfer Processes ◽  
Wave Approach ◽  
Mass Transfer Processes ◽  
Pressure Swing

A new approach to modeling of the pressure swing adsorption (PSA) based on a wave method for calculating non-stationary periodic mass transfer processes is proposed. The analysis of solutions for plants designed to produce oxygen from air is given. The conditions necessary for highly efficient operation of PSA plants are formulated. The results of calculations for various brands of zeolites are followed, allowing optimizing a choice of zeolite for the set working conditions.

scholarly journals Modeling the mass transfer processes in the growth of KDP crystals from solution

2019 ◽  
Vol 21 (1) ◽  
pp. 26-34
Author(s):  
N. A. Verezub ◽  
V. L. Manomenova ◽  
A. I. Prostomolotov
Keyword(s):  
Mathematical Model ◽  
Aqueous Solution ◽  
Mass Transfer ◽  
Crystal Growth ◽  
Potassium Dihydrogen Phosphate ◽  
Dihydrogen Phosphate ◽  
Potassium Dihydrogen ◽  
Transfer Processes ◽  
Mass Transfer Processes ◽  
Kdp Crystals

Finding the conditions of high-speed single crystal growth with an appropriate quality is a priority for the industrial production of crystalline materials. Crystals of potassium dihydrogen phosphate (KDP) are important optical materials, they are grown from an aqueous solution and an increase in the rate of growth and quality of a single crystal is of great practical importance.In this paper, mathematical simulation of hydrodynamic and mass transfer processes in growing KDP crystals is performed. The flow and mass transfer are modeled within the framework of continuous medium, which is considered as an aqueous solution of a special salt — potassium dihydrogen phosphate. This salt dissolves in water to a saturation level at a high temperature. Then, such supersaturated solution is used to grow crystals at lower temperatures in non-flowing and flowing crystallizers. The mathematical model is considered in a conjugate formulation with allowance for mass transfer in the«solution—crystal» system. Local features of hydrodynamics and mass transfer in a solution near the surface of a growing crystal are determined, which can affect on the local (for a particular place and direction) crystal growth rate and the formation of defects. The requirements to the crystallizers that provide the «necessary» hydrodynamics in the solution are discussed. Its validation is shown for the flow around a long horizontal plate simulating the growing facet of the crystal. The rate of precipitation of salt was evaluated by the proposed mathematical model, which matches the calculation of solution flow according to the Navier-Stokes equations for an incompressible fluid with a thermodynamic condition for the normal growth of a face under conditions of two-dimensional nucleation. The action of the flowing crystallizers was analyzed for various solution inflows (axial and ring) and its outflow through the axial bottom hole.

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