Search

Fever is happened when the human having infection or other illness which the body temperature is higher than normal body temperature. The heat load released during the fever cause the uncomfortable condition to the human. Thermoelectric is used in the design of heat exchanger to provide cooling by using electricity which reliefs the fever uncomfortable. The thermal comfort zone for human and the analysis of the heat load from the human head surface are determined. The analysis focuses on the fever teenagers aged range from 15 to 25. The range of the thermal comfort zone is from 20 degC to 25 degC whereas the range for the total heat load from the head surface is from 10.56 W to 16.39 W. The findings from the analysis will be used in the design of heat exchanger that suites the requirement from the analysis result. The fluid flow effect of the working fluid and thermal effect of the heat exchanger are simulated by ANSYS Fluent. In addition, the different types of Peltier plate and fluid as well as the different materials of heat exchanger and tube have applied into heat exchanger design model for observing the effect of the fluid flow in heat exchanger. Using ANSYS Fluent, the temperature contours are compared and found that the combination of alumina Al2O3 nanofluid, copper heat exchanger have better performance due to high heat transfer rate while the tube materials show no effect. The best performance of cooling in the design of the heat exchanger is proposed. These design criteria include the selection of the material of heat exchanger, tube and fluid as well as the selection of the device such as Peltier plate, battery, cooler fan and pump.

The problem of the blind spot zone (BSZ) for motorcycles is common, as it causes many accidents that occur between motorcycles and cars, or motorcycles with other vehicles. The problem of BSZ is occurring for many reasons, such as if the motorcyclist wants to change the lane or manoeuvre or turn without realizing the presence of other vehicle which may cause a terrible collision and leads to casualties, either because of darkness, the full dependence on side mirrors that give a limited scope of vision, or due to a malfunction in the front lights of the car that prevented the motorcyclists from recognizing it. However there were limited research on identifation of BSZ for motorcycle, even though most vehicle accidents in Malaysia involved motorcycles. This paper discusses the initial works on the identification of BSZ for motorcyles. Three types of motorcycles were used to determine the BSZ using grid-based technique. From the data collected, the BSZ was identified for the motorcycles.

Fracture mechanics studies on fatigue crack growth under elastic-plastic condition is usually characterized by J integral range, DJ determined by an approximation from area under load-displacement hysteresis loop developed by Dowling and Begley. Despite being supported by some experimental data which reported that fatigue crack growth rates under elastic-plastic conditions have good correlations with DJ, the applicability of DJ on crack growth in a material subjected to cyclic bending remains inconclusive. In this study, finite element analysis of a four point-bending rectangular plate model with an edge crack length a/W between 0.1 to 0.5 was carried out under displacement amplitude d a between 0.1 to 1.5 mm to represent small to large scale yielding conditions. The elastic component was found to be the driven force of fatigue crack growth parameter in small scale yielding (SSY) condition while in large scale yielding (LSY) condition, the plastic component must be considered. It was also found that the simple method of DJ-integral calculation using load-displacement approach is overestimated for shallow crack under LSY condition.

Analysis of the relation between propulsion angle and thrust generation of SEA-EYE was presented and discussed with three different angles of the boat propeller. The results of this analysis has been decided to solve the problem of the study. Features of SEA-EYE boat and the boat has been analysed in the Ansys Workbench (Fluid Flow CFX). The resulting decision was presented in the form of diagrams, tables and graphs. The results for the three boat propeller angle is almost close to perfect, but the final decision was made after carefully researched and as far as possible.

Annular mist flow generating device is being developed to generate annular mist flow of air and water to simulate two phase flow pattern in the evaporator. The annular mist flow generating device is use for experimental study of the air water flow behaviour that simulates the two phase flow of refrigerant. Annular mist flow at inlet of the dividing header will provide batter air water distribution to the branches. The annular mist flow generating device shall be designed using computer aided drawing (CAD) software. Then, fabricate the annular mist flow generating device. After that, the annular mist flow generating device will be test experimentally by visual observation of the air water flow pattern. The air superficial velocity and water superficial velocity use in this experiment is 1.0m/s - 5.0m/s and 0.015m/s - 0.045m/s respectively. The test channel had a horizontal header with a square cross section of 20mm x 20mm and length of 290 mm with 10 upward branches. In this experiment the air water flow patterns is observed and recorded using digital camera. It was found that the device generate annular mist flow at frontal of the dividing header. This experiment proved that the device is capable of generating annular mist flow within the design range of air and water superficial velocities.

In this study, the main focus is to study the thrust generation of various propeller blade width-spans with the mouth-ring application. By using the parameter, the thrust were calculated based on the value of velocity, voltage and RPM. The testing was performing in three different width-span that are; 10mm, 8mm and 5mm. There are also variable that be tested that cover the reducing the diameter of mouth-ring from 36 mm to 32mm. In addition, if compared the gaps and different position proved that centre position gives better thrust. Furthermore, the application of mouth-ring is evaluated to be good base on this study