Rizwan Ul Hassan

13 Questions 7 Answers 0 Followers

Questions related from Rizwan Ul Hassan

What happens to Washburn model when contact angle is 90?

If we have a hydrophoic surface with contact angle of 90 and DI water has to move bewteen parallel plates then cos90 will be 0 and how can we ammend the system?

18 January 2022 1,737 2 View

Why DI water doesnot follow Washburn model for capillary flow?

I have developed the Washburn model but my experimental results are smaller as compared to the theoretical one, but the trend is similar. When I tried to regenerate the below-mentioned paper, my...

22 June 2020 1,285 0 View

Why DI water doesnot follow Washburn model for capillary flow?

The total length of the rectangular channel is 60 mm but by model, I am getting flow length with a range of 70 mm to 260 mm from 0.1 sec to 1.2 sec respectively. The channel radius is varied from...

05 June 2020 1,357 0 View

What should be the boundary condition for Poiseuille Flow and Couette Flow for continuous inlet flow ?

Let suppose a system with stationary parallel plates and continuous inlet pump-driven flow is flowing between them. So, can we apply Couette flow boundary condition to poiseuille flow as the...

23 April 2020 714 0 View

How to write Navier stokes governing equation bewteen parallel plates with pumping flow?

I was going through the lectures about Poiseuille flow and I got curious about the governing equation of overall fluid velocity varying in 2 different conditions. 1) Poiseuille flow between...

14 April 2020 3,308 0 View

How to calculate impact velocity in fluid dynamics?

If the drop is coming out from a nozzle which hits the surface and spreads in all directions. So how can we calculate the impact velocity to go for dimensional analysis?

23 December 2019 9,551 2 View

What sacrificial materials should be used to detach PDMS from glass substrate?

I have successfully deposited PDMS ( 30um width and 10 um thickness line) on glass substrate but now issue is the detachment. I tried sacrificial layer of poly acrylic acid but during detachment...

15 January 2019 5,194 4 View

What type of Technique, Instrument or method can be used to measure the shape memory properties of polymer?

Dear all, I want to know which methods, techniques are applicable to measure the shape memory polymers properties like shape fixity and shape recovery properties?

31 May 2017 2,302 3 View

Why DMA(Dynamic mechanical analysis) results of shape memory polymers are showing odd behavior?

Dear members, I have a Benzyl methacrylate (monomer) and two types of crosslinkers , di(ethylene glycol) dimethacrylate (DEGDMA),poly(ethylene glycol) dimethacrylate (PEGDMA) and Carbonyl iron...

31 May 2017 9,422 3 View

Whats can be expected applications of 2 different shape memory polymers layered one another?

Dear all, If we have 2 different shape memory polymers with different glass transition temperatures, layered one another along the thickness, then what can be expected applications? What can be...

13 April 2017 4,547 1 View

Which 3-D printing technique is best to use resin type polymers to make shape memory polymers?

I was trying to find the way, whether we can make shape memory polymers by using 3-D printing techniques or not? I found four types like SLA, DLP, Multi jet/ Poly jet and CLIP to make liquid/...

09 November 2016 3,531 3 View

How to find the the material properties along the thickness?

I am trying to find out the the properties of bulk graded composites, along the thickness. Should I have to cut off the the sample and follow the hardness tests and characterization techniques?...

30 September 2016 1,764 4 View

Is there any way to find Loss Modulus and Storage Modulus, Damping factor using experimental determined time displacement values and FFT graph ?

I am new and don't know exactly,what to do other than rheometer determination?

29 June 2016 8,767 2 View