1st years physics students book about: dependent / independent variable, inextensive/intensive variable, internal/external state variables?

Hello, I need a low level educational book explaining the PRACTICAL use (and interrelationship) of dependent / independent variables, inextensive/intensive variables, internal/external variables...

06 July 2018 1,517 0 View

State variables and process variables?

Hello, pressure p (intensive) and volume V (extensive) are thermodynamic state variables - independent on the way how a state was achieved. pdV =W is work and NOT a state variable, but a...

05 June 2018 3,662 24 View

Why can the photoeffect not be explained by wave-energy knocking out electrons?

Hello, the de Broglie relation says: wavelength= h/p (h=Planck const, p=momentum)....means: Lightwaves with a certain wavelength have a momentum. Then waves should set free an electron...

31 December 2017 8,756 4 View

Why can Heat not be Transformed completely into work?

04 May 2017 3,076 6 View

Final Pressure of an isochoric gas-evolving reaction ?

Hello, I got stuck in the thermodynamic problem. You place e.g. Zinc and HCl in an autoclave. Then the H2 evolvement starts.At which pressure will this isochoric reaction stop (pressure dependence...

01 February 2017 5,262 0 View

How evaporates a thin liquid film?

Hello, breathing on a cold window pane results in a thin film. The observation is: the diameter gets smaller with time and the edge is very dynamic! The center seems unchanged until the "shrinking...

01 February 2017 3,696 3 View

How do CO2 bubbles in water grow?

Hello, have a look at a glass of sparkling water or beer. When you observe it over a period of time and the initial heavy sparkling ceased you see a few stationary points, from which very tiny...

10 November 2016 1,331 3 View

Temperature dependence of citric acid solubility in water?

08 September 2016 9,717 0 View

Why is there no Citric acid "self-esterification"?

08 September 2016 8,558 3 View

Commercial Biotech Downstream Separation: Which Substances (Antibiotics, Insulin...) are intracellular (cell disruption) and which are extracellular?

06 July 2016 4,886 2 View

What are the countries most affected by extreme rainfall as a result of climate change?

Increased heat, drought and insect outbreaks, all associated to climate change, have increased wildfires. Decreasing water supplies, declined agricultural yields, health impacts in cities owing to...

01 March 2021 7,168 9 View

What is recommended for solid domain in ANSYS FLUENT?

Should I mesh the solid domain ? or should I use wall thickness? or Shell conduction? for Heat Transfer between two fluids of a Heat Exchanger. what is recommended?

01 March 2021 9,785 3 View

Heat exchanger with liquid Nitrogen as coolant?

I want to cool Natural Gas from 195 Kelvin to 138 Klevin in a heat exchanger by using liquid nitrogen as the coolant medium. When entering the heat exchanger, the liquid nitrogen will have a...

01 March 2021 6,450 5 View

How can i resolve the "final solutuin is not converged" error in Comsol for my heat transfer simulation??

I have been trying to simulate heat transfer problem in Comsol 5.5 for long time but it always throw an error stating: "Failed to find a solution. Maximum number of Newton iterations...

28 February 2021 8,626 3 View

Exit velocity of natural gas from pressurized tank?

Hi Guys. I'm a mechanical engineer and have a bit trouble, would be very glad if you could help me with my questions. I have a pressurized tank which contains Natural Gas at 200 Bar and 293...

26 February 2021 6,253 3 View

Anyone that can help with Maxquant TMT16plex which is missing?

Hi I am very new to proteomics analysis. I have got raw files from core facility running thermofisher TMT 16plex 4 hours. I cannot find on maxquant the option TMT16Plex there is only up to 11...

25 February 2021 1,675 3 View

How to properly calculate the fluid solid heat transfer between polypropylene matrix and glass fiber in a porous medium?

I'm building a cfx model of thermoplastic pultrusion process on ansys and i have a doubt on how is the proper way to set this parameter in a porous medium

24 February 2021 1,915 1 View

How to properly calculate Interfacial area density in a porous domain?which are possible value for glass fiber?

I'm doing a cfx simulation of a multiphase flow in pultrusion and i set the Interfacial Area density in the heat exchange of a porous medium in this way IAD=Total fiber lateral surface of fiber...

23 February 2021 6,043 1 View

Model Volume fraction and magnetic field applications of nanofluids in ANSYS?

Hi I am working recently on a project where I have to study how the thermal properties or heat transfer enhancement of nanofluids as the volume fraction changes, or if a magnetic field is applied...

22 February 2021 961 2 View

Help with assigning pressure boundary conditions in FLUENT on a large structure?

Hello, I created a very tall tower (>1000m) and applied pressure boundary conditions at the inlet (bottom) and outlet (top) that correspond to the pressure are their relative altitudes....

22 February 2021 9,972 4 View