Wanchai Asvapoositkul

Wanchai Asvapoositkul
King Mongkut's University of Technology Thonburi | KMUTT · Department of Mechanical Engineering

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18
Publications
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293
Citations

Publications

Publications (18)
Article
This paper presented an implementation of entropy generation analysis in the main flow field of a water jet pump via the CFD method. This study aimed to identify the inefficient location of energy conversion and to analyse entropy generation sources in each region of the water jet pump. The 2D-axisymmetric model and realisable k-ε (RKE) turbulence...
Article
This study focuses on the influence of dimensionless geometry parameters on the performance and loss coefficient of the throat and diffuser of the water jet pump apparatus. A water jet pump system was designed for a total of nine experimental cases with three different projection ratios and three throat-aspect ratios . The volumetric and pressure r...
Article
Full-text available
The combined pump and hydraulic ram pump (HRP) was presented to evaluate the technical feasibility for increasing pump head. This method was used to demonstrate a possible low‐cost alternative solution to supply water in remote areas. It illustrated the case where energy in rivers was not enough to drive HRP and a pump alone could not lift water to...
Conference Paper
This paper presents numerical validation of hydrodynamics characteristics central water-air ejector in the horizontal direction. Considering variation mass flow rates and back pressure as parameters, computational fluid dynamics (CFD) is performed to analyze hydrodynamics characteristic variables i.e. volumetric ratio, gas fraction and power input...
Article
Full-text available
The possibility of using a hydraulic ram pump (HRP) as a means of utilizing its energy to produce high head for pump has been investigated. To make such a system economically competitive, it is necessary to improve the performance of HRPs. To achieve this improvement, it is also necessary to understand the parameters that marked out the design of c...
Conference Paper
A horizontal liquid-gas ejector performance for mixing two immiscible fluids and generating low pressure are presented in this paper. In this study, Computational Fluid Dynamics (CFD) modelling was implemented to study the effect of projection ratio (x/Dt), on the ejector performance at specific operating condition. Three-dimensional model was used...
Conference Paper
In this paper, the entropy generation rates analysis of three-dimensional water jet pump zones is numerically studied using Computational Fluid Dynamics (CFD) modelling. Entropy generation rate of two different motive fluid velocity, 0.732 m/s and 1.465 m/s, at constant temperature 288.16 K is analysed. Further, the effect of parameters, motive flu...
Article
A newly developed empirical model based on the effectiveness-NTU approach was developed for a dry-cooling simulation to evaluate the thermal performance of air-cooled heat exchangers. The value of this model is that air-cooled heat exchanger performance can be studied in a variety of working conditions. This information is useful in dry-cooling sys...
Article
The performance of hybrid cooling tower is analyzed using experiments and numerical simulations on a wide variety of working conditions. A computational model for predicting the behavior of dry, wet and hybrid cooling systems has been developed. The hybrid cooling tower model is expressed as a combination of a dry cooling model and a wet cooling mo...
Article
The performance characteristics of a new type of cooling tower, which is called water-jet cooling tower, are analyzed using experiments and numerical simulations. The water-jet cooling tower would be designed as a modified wet cooling tower, operating without fill and fan. A comparison of the water-jet cooling tower test results with those of the m...
Article
The thermal performance capacity of a wet cooling tower is dominated by weather conditions, particularly ambient wet-bulb temperature. In this paper, the tower performance was predicted by a simplified model which was characterized by specification of a mass evaporation rate equation. The purpose of this study was to present a calculation that was...
Article
The purpose of this study is to analyze the influence of the ambient temperature and humidity on the performance of a counterflow wet cooling tower according to the second law, exergy analysis, of thermodynamics. First, the properties of water and air flow through the tower were predicted and validated by the experiment. Exergy analysis then has be...
Article
Cooling towers are used to extract waste heat from water to atmospheric air. An energy analysis is usually used to investigate the performance characteristics of cooling tower. However, the energy concept alone is insufficient to describe some important viewpoints on energy utilization. In this study, an exergy analysis is used to indicate exergy a...
Article
Enhancement in heat transfer using the electrohydrodynamic (EHD) technique is numerically examined in laminar forced convection across a tube bank with six different wire electrode arrangements. The electric field is generated by the wire electrodes charged with high DC voltages ranging from 7.5 to 17.5 kV. The Reynolds number corresponding to the...
Thesis
The aerodynamic behaviour of turbomachinery is dominated by viscous effects. In the design of a component for the machine, inviscid methods are normally employed. However, it is useful to cover the viscosity in the calculation to achieve a better understanding of the fluid behaviour. This feature can be analysed by using Navier-Stokes calculations...
Article
In cooling towers heat and mass transfer between warm water and ambient air are performed. The water make-up is required in order to compensate of the water losses due to evaporation, drift loss and blow down. In this study the effects of wind on the drift loss of a cooling tower are considered. The loss involves with external effect (e.g. wind and...
Article
The computational method based on three-dimensional inverse design in inviscid flow is applied to the design of 0.78 m diameter single stage axial flow compressor. By applying this method, the blade shape is computed for a specified distribution of swirl distribution. A useful design of the method is that the blade shape is compatible with prescrib...

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