The three objectives of this experiment were to determine the experimental and theoretical overall heat transfer coefficient, the effects of insulation, and the number of fouled tubes in the shell and tube heat exchanger. The flow rates of the hot water supply to the tubes and the cold water supply to the shell were varied, and temperatures for the hot inlet, hot outlet, cold inlet, and cold outlet streams were recorded. These temperatures were recorded for each of the three experimental…
tensile stress without breaking. It exhibits opposite characteristic to brittle. High ductility enables copper to be easily shaped into thin wire.
Generally the advantages of copper and its alloy include:
• Excellent electrical conductivity
• Excellent heat conductivity
• Good corrosion resistance
• Good machinability
• Retention of mechanical and electrical properties at cryogenic temperatures.
Nanotubes, specifically the carbon nanotubes are just one of the handful of structures engineers and scientist use today that fall in the nanoscale category. Structures in the nanoscale category are usually between 1-100 nanometers, which one nanometer is one-billionth the size of a meter. A confusing yet beneficial property found in materials at the nanoscale is a concept call quantum called quantum mechanics. In quantum mechanics the laws of classic or Newtonian…
is the composite which exhibit at least one dimension of the nanoparticle size material . The nanoparticle size is mainly used as the disperse particle system to enhance or improve the properties of the composite material such as strength, conductivity and wear resistance. The main reason for using nanoparticle is because of their large surface to volume which increases the filler- matrix interaction, thus increasing the effect of the material properties .
According to Yang et al,…
its general, mechanical, thermal, electrical, optical and environmental properties, suitable materials were listed, limited and compared, utilizing the Selection Data tools in the form of graphs, limitations and trees.
Material Possible Utilisation Properties
Age-Hardening wrought Al alloy -Handle Bars
-Base Plate (with texturing) -Non-flammable
-Good UV radiation resistance
-Excellent water resistant (fresh, only moderately for salt water)
-Good thermal conductor
2.1 Polydimethylsiloxane (PDMS)
Polydimethylsiloxane (PDMS) own to a group of polymeric organosilicon compounds that are commonly stated as silicones. PDMS is optically clear, and, in general, non-flammable, non-toxic, and inert. PDMS is viscoelastic, meaning that at long flow times (or high temperatures), it acts like a viscous liquid such as honey. However, at short flow times (or low temperatures), it acts like an elastic solid such as rubber.
In other words, PDMS will flow to cover the…
The used solar air collector is a single-glazed plate, we summarise the main components as follows:
A single transparent glass cover of dimensions 4 mm thick, transmits the heat flux to the absorber plate, ensures the reduction of thermal losses due to the heat exchange by convection and radiation and protects the absorber from the outside environment.
A thin copper absorber plate with a black chrome finish on it, which was 1.5 mm thick.
A polystyrene sheet with a thickness of 40 mm,…
Typical application and thermometric error
Consider a typical application such as the measurement of surface temperature by a surface mounted thermocouple as shown in Figure 5.9 (a).
Figure 5. 9 : (a) Surface mounted thermocouple in Example 5. 1 (b) Thermal resistance
Heat loss from the thermocouple is modeled as shown above by discussion leading to Equation 5.3. Thermocouple attached to the surface of a massive solid whose temperature we would like to measure. Excepting where…
3. Preparation of microemulsion:-
Microemulsion was prepared by dispersing required quantity of Aripiprazole (15 mg/ml) in appropriate quantity of oil. The mixture was homogenized and to it, accurately weighed quantity of surfactant: cosurfactant blends was added in small portion with stirring. The blends were mixed thoroughly using magnetic stirrer and to it add dropwise double distilled water with continuous stirring around 10 min. compositions of ARP microemulsion shows in Table 1.
exhibited satisfactory wear resistance. Tungsten carbide is an advanced ceramic material combining a unique set of properties such as high hardness, high melting point, wear resistance, good thermal shock resistance, thermal conductivity and good resistance against oxidation. They can be applied as coatings by thermal spraying processes such as plasma-spraying, high-velocity oxy-fuel spraying and detonation gun methods .
Bell and Sun (2002) discussed that a low temperature plasma carburizing…