Questions tagged [chemical-engineering]

Use this tag for questions within the problem domain of chemical engineering.

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Calculating enthalpy of incompressible liquid and ideal gas?

I have been tasked with creating a Mollier diagram for water using the Redlich-Kwong EoS. In order to calculate the real enthalpy and entropy values using departure functions and residual properties I ...
17 views

Continuous stirred-tank reactor (CSTR) in parallel problem

I am having a difficult time solving the following problem. The only thing we learned in class was parallel continuous stirred-tank reactor (CSTR) with equal-sized reactors and equal flow rates for ...
32 views

Single Stage Equilibrium Problem

I am working on this problem below. Two lb-mol of an equimolar mixture of ethanol-water that is a vapor at dew point at 14.7 psia is mixed with 4.09 L water ($\rho$ = 1 g/ml) at $60^o F$ in an ...
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Is half of depletion region a part of N region or P region?

Is it correct to say that if the P-N junction is in the middle of the depletion region, half of the depletion region is for the P region and the other half is for the N region?
1 vote
36 views

Why heat transfer happens only via conduction in this case?

Why heat transfer between a heated flat plate and a fluid happens via conduction only and not convection, when the fluid is present below it? Consider a plate under which a fluid is present and it ...
1 vote
51 views

Fastest possible mean (peak?) piston speed on a Diesel engine

On a Diesel engine running distillate fuel (the kind you run in cars, SUV's, trucks, trains, boats, and smaller ships), what are the theoretical and practical limits to maximum mean piston speed you ...
23 views

Mean temperature of a fluid in a pipe

Consider a pipe in which a fluid flows such that the pipe is at a higher temperature than the fluid. At any cross section of the pipe we get a varying temperature profile. We can define a mean ...
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Size characterization

Which technique can I use to characterize the size of my particles? They would be in the range of 50 μm to 300 μm. I have verified using a microscope, but I need a technique to analyse the size ...
1 vote
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Preventing leakage in sludge tank

I recently went on a tour to a local water company plant where we were shown a sludge tank which is where the sludge in the water is removed and stored here. The sludge can be acidic and so can cause ...
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35 views

Handling the source term in the convection-reaction-diffusion equation

The 1D convection-reaction-diffusion equation for solute transport is given as: where C is the concentration, v is the flow velocity, D is the diffusion coefficient, S is the source/sink term, and R ...
47 views

Nozzle inlet and outlet diameter for a shell and tube heat exchanger

Hi I have designed a shell and tube heat exchanger to cool octane and water. I have all the dimensions but I was unsure which equation to use to calculate the diameter for the inlet and outlet nozzles....
28 views

Plug Flow Reactor Concentration UDF Debugging

I'm new to CFD and I'm trying to write a UDF that calculates the concentration at any position as a function of its x-coordinate (for example, Ca = .5C - .1x, or dCa/dx = -kCa). This is my first time ...
31 views

Thermal conductivity and the second law

I am having trouble figuring out the solution for part d. Can anyone give me a hint?
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Question regarding evaluating 1D heat transfer PDE

My question regards cooling of an object using 1D-heat transfer with fixed surface temperatures. First I need to find the solution to this PDE: Based on the conditions, I worked out that the ...
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1 vote
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CO2 production from sugar [closed]

Greenhouses often use burners for CO2 enrichment, which requires a source of liquid propane or natural gas. The yeast fermentation process can also be used to create CO2 for a greenhouse by supplying ...
58 views

More temperature after boil the water can cook more faster the food?

My Question was not well received in physics.stackexchange.com and I get a simple answer when I want to know the theory inside this question. I want to cook more efficient wasting less ( gas or ...
88 views

How do you imagine momentum?

If you want to explain it to a layman (who belongs to the science stream ofc!!) how do you explain it? Also, what is momentum transfer when it comes to fluid mechanics?
1 vote
53 views

Method of separating oxygen from a mixture of oxygen + carbon monoxide

I have a 99,9% oxygen, with 0,1% is CO. Is it possible to separate the CO from oxygen in this mixture? The closer the percentage to 0 for CO, the better. I've read about separation of oxygen from air, ...
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How to model a condenser (heat exchanger) where both streams are two fluid mixtures?

As mentioned I would like to model a heat exchanger (using Python). In this case, the condenser/hx streams are both a mixture of O2 and N2 These are known for both streams: Inlet temperature Inlet ...
63 views

Calculating gas volume in a gas-liquid system/pressurized vessel

There is water in a tank and the tank is connected to a piece of piping that has a volume of 2.5L. The headspace above the water is pressurised by using air, to a pressure of 3 bar (a). What happens ...
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Aluminum or Copper, which one is better to control and maintain the temperature?

Friends, I am an EE/SW/Controls eng. Please, pardon me of perhaps incorrect terminologies. I am working on a R&D project: A chemical lab equipment has a 2" long metal pipe enclosed in ...
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1 vote
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Why are there no propane refrigerator air-conditioning units that run on solar heat?

I was thinking about how hot it was outside, when a thought came to me. There are propane refrigerators, so why not replace the propane as the heat source with solar heat and then change it from a ...
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Is there a maximum life for things made out of stainless steel or cast iron?

Do steel objects have a maximum lifespan? I read that "316 stainless steel is estimated to last for 1200 years in a “rule“ environment before heavy pitting. In the marine environment this is ...
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Book recommendation for hydrodynamics of bubbles, drops, and particles

I am wondering if someone could please recommend to me some references on the topic of hydrodynamics of bubbles, drops, and particles, preferably in the context of complex and bio fluids. I am ...
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1 vote
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what are some books/academic journals which I could read on renewable energy/technology? [closed]

Book suggestions on renewable energy technologies/sources
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Industrial recycling of mirrors

I learned recently that mirror is mostly manufactured by pouring thin metal coating (i.e alumunium) on top of a substrate surface (i.e glass), Due to the nature of this composition it cannot be easily ...
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1 vote