Observation of Free Surface Flow Behavior Using Laser Tagging Method by Photochromic Dye Tracer

学位記番号:工博甲49

Development of TiO2 coated activated carbon foam as cooling pad for direct evaporative cooling system

This research aims to examine the property of the ceramic (TiO2) coated activated carbon foam (TiO2-ACF) as a cooling pad. Efficiency of direct evaporative cooling system mostly depends on the cooling pad and hence, the material used in the cooling pad plays a very vital role. Here, the TiO2-ACF pad is fabricated by dipping activated carbon foam into the slurry of TiO2 which has different loading mass. The physical property of the TiO2-ACF such as stability of the cooling pad under constant and vigorous flow of water, absorbability property and photocatalytic properties were analysed. It is concluded that TiO2-ACF cooling pad can be easily fabricated and have an excellent stability and absorbability property

Simulation study of cooling system for photovoltaic panel using ansys

Photovoltaic or PV system are very important nowadays because of its functionality of absorbing energy of sunlight and convert it to electric energy. By applying the PV panel, it can cut the cost of billing for the users. It also called a green technology because it produces clean of the energy that can avoid from global warming and air pollutant. Despite of the benefits that it produces, the efficiency process of the system depends on how it been take care. The PV panel cannot be exposed to the high temperature of sunlight. If PV panel getting hot, the PV panel system cannot produce a full of its efficiency to user. By applying the cooling system on the PV panel, it can control and reduce the temperature of PV panel when the temperature increase. The simulation run was taken place in this research by using Ansys software. The result shows the reduction of the temperature of PV panel by applying mass flow rate of air and water. The inclination angle also plays a role in the simulation because if the angle of inclination of PV panel exposed more to sunlight it easily can make the PV panel hot. When the values of the mass flow rate increased, the lower the temperature of the PV panel can be achieved

Study of oil flow rates effects on lubricant oil behaviour during minimum quantity lubrication milling process

Minimum quantity lubrication (MQL) technology has been utilized extensively on these days as an alternative method to conventional cooling technique. A study to understand the know-how of tiny lubricant oil mists to effectively penetrate the cutting zone is important. However, such study is still scarce since the setup of the experimental probe during the machining process is on-going is difficult. The objective of this study is to analyse the lubricant oil film behaviour accumulated on AL6061 workpiece during MQL milling process by using a non-intrusive technique called as laser-induced fluorescence (LIF) method. The experiment was conducted under different oil flow rates to measure the thickness fluctuation of the lubricant oil film. Moreover, the surface roughness of workpiece after the milling process was also measured. As a result, the lubricant oil thickness was found to fluctuate in between 0.2mm and 0.4mm for two lower oil flow rates due to the tendency of evaporation. At higher oil flow rate, the lubricant oil fluctuated at higher thickness, i.e. 0.4mm and 0.5mm. On the other hand, the obtained mean surface roughness values did not reveal any remarkable difference from each other. However, lower mean surface roughness values were detected at 90mm distance from machining starting point due to the accumulation of lubricant oil towards the end of workpiece. Therefore, the results of the oil behavior were successfully confirmed and thus MQL milling performance under different oil flow rates condition was clarified

Observation of free surface flow behavior using laser tagging method by photochromic dye tracer

Free surface flows are ubiquitous in our daily life. For instances, the river flow, sea wave, rain droplet, water column flow out from a water tap and water flow in a drain are among the examples of free surface flow that commonly found in our everyday life. Moreover, the free surface flow is also observed in many branches of the industrial fields including the atomization process in automotive engine, wall surface flow related to heat and mass transfer facilities as well as the wave surface flow related two phase flow in thermal exchanger

Measurement of liquid film flow on inclined wall using photochromic dye marking method

The objective of present work is to apply a liquid film measurement technique, which is called as photochromic dye marking method. This technique utilizes a color change of the photochromic dye contained in the test film when ultraviolet (UV) light from Nd: YAG laser (X 355 nm) is irradiated. The movement of the dye trace formed by the UV irradiation is then captured by a high speed video camera and analyzed to obtain the surface velocity. The movement of wave passing by the dye trace is also analyzed and comparison between them is made to investigate the velocity change. The data regarding such information is nowadays lacking. Apart from the measurement as mentioned above, this paper also aimed to produce the average waves velocity and film thickness results data. The wave velocity is measured by cross correlating two signals of light intensity from two laser beams spaced in a known distance; parallel with the film flow direction. Taking advantages from one of the laser beams sourced from a diode laser light (X= 407 nm), the thickness is determined based on the intensity of absorption light passing through the test film contained a fluorescent dye, coumarin-153. This technique is a non-intrusive and easy technique to be conducted, as it only requires simple optical arrangement and calibration process. The data from this study are also compared with previous published results [1],.[18], [19]. The experiment is conducted at different inclination angle from the horizontal direction (0= 300 , 60°, 90°). The 'effects of Reynolds number (Re= 50.8, 81.3, 108.4, 138.9) and film flow characteristics at various positions on the inclined wall defined as distance from liquid inlet (x= 60 mm, 100 mm, 140 mm, 180 mm) are investigated

Measurement of Liquid Sheet using Laser Tagging Method by Photochromic Dye

Liquid atomization system has been extensively applied as the most significant process in many industrial fields. In the internal combustion engine, the combustion phenomenon is strongly influenced by the spray characteristics of the fuel given by the atomization process. In order to completely understand the whole atomization process, a detail investigation of relations between the liquid jet characteristics and the breakup phenomenon is required. In this study, a non-intrusive method called as laser tagging method by photochromic dye has been developed with aim to study the breakup process of liquid sheet in detail, covering from the behavior in film until disintegrated into ligament and droplets. The laser tagging method by photochromic dye is based on a shift in the absorption spectrum of photochromic dye molecules tagged by ultraviolet laser. The shift results a color change at the tagged region of liquid containing the dye. In this study, the motions of the dye traces were analyzed as the liquid surface velocity. As a result, liquid sheet was found to keep its velocity constantly in film before suddenly increase around broken point. However, it then decreased after broken into droplets. By forming a set of four points of dye traces on the liquid sheet, the change of relative position of the set enabled the measurement of deformation and rotational motion of the liquid sheet. As a result, the normal strain of the liquid sheet parallel to the flow direction depended on the flow behavior of ligament formation

iMEC-APCOMS 2019 the best platform to exhibit industry and manufacturing engineering research product

Faculty of Manufacturing and Mechatronics Engineering Technology (FTKPM) has successfully organized the 4th International Manufacturing Engineering Conference (iMEC) 2019 on 21st to 22nd August 2019 at The Everly Hotel, Putrajaya, Malaysia

Simulation on effect of preform diameter in injection stretch blow molding

Polyethylene terephthalate (PET) is the most common material of resin for manufacturing plastic bottle by injection stretch blow molding due to its excellent properties. As various issues of health and environmental hazards due to the PET use have risen, PET bottle manufacture may be improved by minimizing the wall thickness to reduce the PET use. One of the critical qualifications of the manufacturing process which lead to the wall thickness distribution is the initial preform diameter. In this project, we used the ANSYS Polyflow with aim to evaluate the wall thickness distribution of PET bottle for different diameter of initial preform. As a result, only 4 mm preform diameter presented wall thickness below than 1 mm. On the other hand, at least 6 mm preform diameter can permit the wall thickness 1.3 mm i.e. at the shoulder area