Danielle Nel

8 Questions 9 Answers 0 Followers

Questions related from Danielle Nel

Are head losses negligible in compressible fluids?

The energy equation that I found for steady, compressible fluids comes from source: "Cengel, Y. A. & Cimbala, J. M., 2018. Chapter 8: Internal Flow. In: Fluid Mechanics Fundamentals and...

03 November 2022 8,398 4 View

Is the loss coefficient (K) independent of size of pipe/fitting and material?

Is the loss coefficient (K), used in the determination of head losses, is independent of size of the piping and the material type? I have looked in multiple textbooks and online resources but...

03 November 2022 8,596 3 View

Do extended batch fermentations result in decreased ethanol productivity in S. cerevisiae when performing fed-batch fermentations thereafter?

I completed a fed-batch fermentation with the addition of spent sulfite liquor (SSL) (a waste stream produced in the paper and pulp process) to S. cerevisiae that terminated with a 60 (v/v) % SSL...

10 November 2021 4,037 7 View

How do I prevent the ethanol losses in shake flask fermentations?

I am fermenting genetically engineered yeast with spent sulphite liquor to produce ethanol, however, after extracting samples and analysing the ethanol present, the concentration of ethanol...

22 August 2021 448 4 View

How would I defrost a frozen glycerol stock of S. cerevisiae to incubate it directly from the Eppendorf tube to the YPD solution?

If I take a frozen glycerol stock out of the freezer, can I leave to to defrost then immediately place it into the inoculating broth as my started culture and incubate it thereafter? I do not...

30 June 2021 5,734 3 View

How would I determine the dry cell density of an inoculum of S.cerivisiae in real time?

I am required to input a cell density (between a range of say 1 - 2 g/L) of an inoculum into fermentation media but I am unsure of how to obtain the dry cell density of the sample in real time,...

18 May 2021 8,451 7 View

When does someone use corrected fin length and the actual fin length in heat transfer problems?

In some instances the extended length of a fin is used but then in other instances the normal fin length is used in extended surface heat transfer problems.

24 March 2020 7,952 4 View

How will I calculate the surface temperature of a HDPE pipe that is exposed to the sun?

I need to calculate the final temperature of a pipe that's been lying in the sun for the day, however, I am unsure how to do this. I know how to calculate the heat transfer through the pipe wall...

20 January 2020 1,508 10 View