Recent content by davidgrant23

Hi Anorlunda, The rotating kiln is inclined slightly away from horizontal (1-5 degrees). The solid particles are fed at the elevated end and travel towards the lower end through rotation of the kiln. While they are traveling a counter-current gas flow is passed through the kiln. The problem I...

Hi there, I am currently looking to build a rotating kiln to provide the necessary heat/res. time/gases to react a solid feedstock. The problem that I can envision, however, is that the solid (which is fed as small particles) may become entrained in the counter-current gas flow inside the...

In order to do this I would need to know Q, which in this case is the heat transfer by conduction. All I know in this problem is the dimensions and material of the wall separating the two regions, the power of the flow in the hot zone (W), and the power required for the reaction (W) from...

Hi there, are you referring to the thermal conductivity of the wall? I have assumed a value of 25 W/mK for stainless steel. I can also assume an air boundary on either side of the wall. This allows me to calculate Q = k*A*(dT/x), where x is the thickness. What I am unsure of is how to interpret...

The actual reaction that we are trying to achieve is pyrolysis. The biomass, which is situated inside the vessel, is heated to elevated temperatures where it undergoes thermal decomposition to give various solid, condensable, and non-condensable products. Given the complexity of the pyrolysis...

Hi Russ, yes you are right. My fault there.

Hi all, I am currently considering a heat transfer problem. In this problem a rectangular vessel made of stainless steel is heated by a surrounding jacket with hot combustion flue gases flowing through it. This means that the heating of the rectangular vessel is achieved primarily through...

Hi there, I have a problem that I cannot find a solution too. In this problem I have a fuel (approximately natural gas) supply which is combusted when mixed with air inside a burner. The flame that is then generated is used to heat up a sealed cylindrical vessel (the flame is on the outside of...

Hi Simon, Just to give you a bit of background info, I essentially draw air through a device that separates out particulates based on their inertia and therefore size. There are 8 stages, each separates out the particles in the size range given in my initial post. Now, we know the mass of air...

Hi all, I am currently operating a piece of equipment that essentially collects particles and separates them based on their size. Essentially you have 8 stages, and each stage has a differing size of particles it collects. For example: Stage----Size of Particles (D) (um)-----Mass Collected (M)...

Hi there, Could someone explain to me why fossil fuels, such as coal and oil, produce fewer particulate matter emissions than natural gas? Also, how would you expect the combustion temperature of these fuels to affect particulate emissions? Would a higher temperature lead to a more complete...

Hi there, I am currently doing leak testing for a piece of equipment. In order to do so I have a flowmeter at the inlet and outlet (of what is essentially a long cylinder) and have air drawn through by a vacuum pump. Now, the problem is that even with no obvious signs of leaks the two flows...

I know the volumetric flowrate from a flowmeter placed upstream of both. So all I do to get the Re is Re = 4Q/(πνD).

Hi there, I have a double-barreled question for you all. So I have two pipes connected to each other. The first pipe is 0.64cm and has a Re = 5000, the second pipe is 4.5cm and has a Re = 700. The two are connected so that the gas expands from the the first pipe to the second. Now, I wish to...

Hi there, I have been in contact with a manufacturer as I require both a pitot tube and a differential pressure transmitter for my process. Both will be used in a small scale process (around 10 l/min). I want to ask if it is possible that a flowrate can be too small to generate a large...