As was discussed before, heat exchanger are equipment used for heat transfer between two fluid flows with different temperatures. In design of heat exchangers such as double pipe heat exchanger, shell & tube heat exchanger, etc., it must be noted that there are some factors that affect the heat transfer rate during the equipment operation period. One of the most important factors is called fouling.
Chemical Engineering AppSuite HD is a free chemical engineering app introduced for Apple iPad and iPhone. Using this freeware, you can find specification of materials, steam pressure and temperature data, thermodynamic and fluid dynamics tools and many more …. This app is free and available on itunes.
Heat exchanger calculator is a program written for shell and tube and double pipe heat exchanger. The full version software costs 89 USD, but the demo version works well, except you can change the shell or tube fluid flow rate. You can use this software to do your heat exchanger calculations easily and freely. More free chemical engineering software will be added soon.
Natural gas, a mixture of light hydrocarbons has clean burning characteristics led to increment of its use in vehicles as a clean fuel. Natural gas contains mostly methane and ethane. These light gases have very high vapor pressure at ambient temperature and their storage require high pressure compression or reduction of temperature extremely.
I want to introduce a package for drawing chemical structures i.e. ACD/ChemSketch. You can draw chemical structures including organics, organometallics, polymers, and Markush structures by this software. It is also possible to calculate molecular properties with this software. You can view the structures in 2D and 3D views. Another important thing is that this software is FREE . . .
Sugar is crystalline carbohydrate made of sucrose. It is glass clear with sweet taste. It is considered to be a human food and is used in candies, … . Our body uses sugar and oxygen to produce daily energy. Sugar is usually extracted from sugar beet and sugarcane. Here is 100x microscopic images of sugar crystal.
Walnut is a seed containing high amount of proteins and fatty acids. The protein content will provide amino acids to body. Walnut also has high amount of fiber. It is often eaten raw. Here is a 100x and 300x microscopic image of Walnut green skin.
In the 2nd part of this article, the calculation of convective heat transfer coefficient was explained. In a double pipe heat exchanger the internal and external heat transfer coefficients are different and it is required to use an overall heat transfer coefficient to perform the calculations.
As was mentioned before, UC, is defined as follows based on convection heat transfer coefficients:
The cotton yarn under microscope is amazing. There are several threads going in each other. It is enjoyable. Here we have provided two images one with 100x zoom and the other is with 300x zoom.
Foot finger has some lines and this view under microscope is amazing. Below we have provided finger skin microscope photo both at 100x and 300x zoom. The lines are those which makes the finger prints.