Does the heat transfer coefficient increase during coupled mass transfer? Is there any correlation which accounts for such a correction?

Standard Hausen's correlation for Nusselt number predicts heat transfer coefficient which are found to be lower than those measured experimentally in a pervaporation process. What could be the...

05 June 2018 1,358 3 View

Can liquid water saturation occur in a pore at RH<100 %? Does the pore need to be hydrophilic for liquid saturation?

I am asking this question in context with a two phase flow in porous media. Thanks!

02 March 2018 2,890 1 View

Can there be an order of magnitude or higher difference between in-plane and through-plane thermal conductivity of a porous polymeric matrix?

08 September 2017 1,806 6 View

What is the effect of temperature on water content of Nafion at 100 % RH?

05 June 2017 999 2 View

How is effective diffusivity in membranes related with the density ratio of membrane and the diffusing species?

What is the physical significance of introducing density ratio in estimation of effective diffusivity in membranes?

05 June 2016 4,830 2 View

Are the heat and mass transfer coefficients co-dependent on each other in a combined heat and mass transfer phenomenon such as humidification?

In a typical shell and tube membrane humidifier module, heat and moisture are exchanged between the wet and dry fluids flowing on either side of the membrane. Now, is there a correlation that...

11 December 2015 8,378 8 View

What is the minimum temperature attainable through passive cooling in an 'enclosed space'? Wet bulb temperature or dew point?

Say for example, A Zeer Pot system undergoes cooling due to evaporation of water. Now what would be the minimum temperature at the center of the Pot considering the top and bottom are perfectly...

03 April 2015 2,815 3 View

What theoretical or experimental techniques can be used to determine the different kinds of overpotentials in PEM fuel cells?

I have already carried out polarization studies and electrochemical impedance measurements but the trends obtained from both techniques do not match. Could there be another method which could give...

01 February 2015 432 3 View

Polymer composites suddenly solidifies?

I am making polymer composite by solvent mixing method. When I am trying to add filler solution in polymer solution it quickly get solidified. How to make them then uinform? It doesn't give time...

03 March 2021 7,540 4 View

How the parameters (such as Mw, Chemical bonds, polymer bland and so on) affect the mechanic property of polymer (such as storage, loss modulus) ?

Anyone can recommend any books on such topics? Thanks in advance.

02 March 2021 8,457 2 View

How do I determine the degree of polymerization of PEG 400 based on NMR integration?

Hello, I am working on the photocatalytic degradation of PEG 400. I would like to know if it's possible to determine the degree on polymerization based on NMR integration, or by the MW of the...

02 March 2021 6,186 3 View

How to polymerize TEOS?

I want to polymerize TEOS on a surface. I know that NH4OH is a preferred catalyst and an alcoholic solvent should be used .But I can not find certain amounts of each material to use. Does any one...

02 March 2021 1,404 6 View

Can polymer concentrations be calculated based on the number average molecular weight?

Hello, I spin-cast two different polymers onto wafers and measure their height as a function of initial concentration. For polymer A, I have the weight-average molecular weight (Mw) as well as...

28 February 2021 7,882 2 View

POlymer+DMSO solution and moisture??

What could be the reason of moisture at the sides of Vial when I am preparing my polmyer+DMSO solution for membrane fabrication? What etiquettes I am possibly missing here?

28 February 2021 6,516 5 View

How to reduce residual stresses in MD simulation?

I am working on a preparation of representative polymeric structures of some popular polymers, such as polyimide or PTFE for MD simulation, during which a single nitrogen or oxygen atom will be...

24 February 2021 8,105 3 View

How to identify what type of fillers are in a polymer?

Hello everyone, I have some PHAs blended with fillers and nucleating agents, yet I don't know what kind of fillers or nucleating agents. The producer has shut down and there's no way to get in...

24 February 2021 1,356 8 View

How can I selectively dry etch Ti on a polymer substrate?

24 February 2021 5,378 1 View

How to do a surface treatment of uncoated TiO2 with polymer?

Basically, I would like to know how to treat or coat on the uncoated bare TiO2 (Ti-OH rich) surface with polymer which has anchoring groups in the polymer structure like trimethoxygroups. What is...

21 February 2021 4,657 6 View