It is a shame the bourdon gauge experiment didn’t work, but the observations of both sets was really interesting! Great job on the video once again Pat👍
A way I would recommend doing this experiment: Rather than connecting to an end-cap, connect to an open valve with the proper plumber's tape to seal the threaded fitting. Let in the 1 atm of pressure at sea level, and close the valve before transporting it to high elevation. This way, you can seal your sample without increasing the pressure.
Hey Jorge. I actually thought you made this comment but n my “What happens when you increase pump suction pressure video”. There I show you an example of a pump whose suction pressure is in fact negative (I.e vacuum/pressure less than atmospheric). But pumps can have both positive and negative suction pressures depending on what is upstream of them. If a pump draws from a vessel under pressure then the pressure will be positive. If a pump draws from an atmospheric tank with a low level, and that pump has a long suction line, then the dP in that line can cause the suction pressure to drop below atmospheric (negative gauge). Both are possible.
@@ProcesswithPat Hi Pat, I've just start following you. I will look into that video. So here why my question, Could we have a blower "sucking" from a recipient that it's at 10kpa and in the vacuum line we will have suction but as the Blower it's just making a vacuum pressure of 4 kpa we will be reading in the manometer 6kpa. But the blower will be working fine as it is making the depressure. Also, this blower has a filter in the vacum line. How will the diferrential presure of this filters work when it gets dirty in the reading of the vacum line manometer? I'will have less "vacuum"? Thank you for your channel. I'm looking at all the videos, they are pretty interesting and fun. Keep the hard work mate.
If you convert it to absolute pressure there is never negative pressure. Nothing ever sucks, higher absolute pressure on the other side always pushes out.
Can u please make a video explaining "Glashier's law" in case of relating "dew point temperature, wet bulb temperature and dry bulb temperature and ambient temperature". I mean, (T1-T)=G(T1-T2) , where G is Glashier's constant.
Hey there! So I had never hear of Glashier's law, and all I can find is the Wiki page for the meteorologist James Glaisher, whom I presume you're reffering to? I can however look into deriving the relationships if you explain what you need...
@@ProcesswithPat Exactly, that's James Glashier's law ! It would be good if could send u the text regarding the law , but wait I'm giving u the link , ... pardon me for late reply.
@@alzenodoe5765 I think that is a linear approximation. The relationship among these variables is extremely non-linear, and is based on the Antoine equation for the temperature vs pressure equation of water's boiling point. This is why you either use the chart, or a program with the functions built-in (as I do with EES), rather than calculating the formulas by hand. I just explored this, given the case of 100kPa and 50% relative humidity. I'm assuming T1 = dew point, T2 = wet bulb, and T = dry bulb in your formula. If that's the case, the value of G was nowhere near constant, when I swept T from 0C to 40C
It is a shame the bourdon gauge experiment didn’t work, but the observations of both sets was really interesting! Great job on the video once again Pat👍
Thanks! But only a part of it didn't go as planned. Still, no result is still a result, right? Wasn't going to withhold the results!
A way I would recommend doing this experiment:
Rather than connecting to an end-cap, connect to an open valve with the proper plumber's tape to seal the threaded fitting. Let in the 1 atm of pressure at sea level, and close the valve before transporting it to high elevation. This way, you can seal your sample without increasing the pressure.
Really interesting Pat - I'd never noticed the reported air pressure in Jo'burg before.
Loved this one, Pat!
Hi pat. I've a question. Suction is always negative? Why don't we have negative pressure in the suction of a pump?
Hey Jorge. I actually thought you made this comment but n my “What happens when you increase pump suction pressure video”. There I show you an example of a pump whose suction pressure is in fact negative (I.e vacuum/pressure less than atmospheric). But pumps can have both positive and negative suction pressures depending on what is upstream of them.
If a pump draws from a vessel under pressure then the pressure will be positive.
If a pump draws from an atmospheric tank with a low level, and that pump has a long suction line, then the dP in that line can cause the suction pressure to drop below atmospheric (negative gauge).
Both are possible.
@@ProcesswithPat Hi Pat, I've just start following you. I will look into that video.
So here why my question, Could we have a blower "sucking" from a recipient that it's at 10kpa and in the vacuum line we will have suction but as the Blower it's just making a vacuum pressure of 4 kpa we will be reading in the manometer 6kpa. But the blower will be working fine as it is making the depressure.
Also, this blower has a filter in the vacum line. How will the diferrential presure of this filters work when it gets dirty in the reading of the vacum line manometer? I'will have less "vacuum"?
Thank you for your channel. I'm looking at all the videos, they are pretty interesting and fun. Keep the hard work mate.
I’m not sure I understand your question man… wanna try rephrase?
If you convert it to absolute pressure there is never negative pressure. Nothing ever sucks, higher absolute pressure on the other side always pushes out.
Great content.....
What south Africa😳, be safe from omicron varient 😅
Great timing for holiday, huh?
Interesting. Take care while travelling.
Thanks AJ!
Can u please make a video explaining "Glashier's law" in case of relating "dew point temperature, wet bulb temperature and dry bulb temperature and ambient temperature". I mean, (T1-T)=G(T1-T2) , where G is Glashier's constant.
Hey there! So I had never hear of Glashier's law, and all I can find is the Wiki page for the meteorologist James Glaisher, whom I presume you're reffering to? I can however look into deriving the relationships if you explain what you need...
@@ProcesswithPat Exactly, that's James Glashier's law ! It would be good if could send u the text regarding the law , but wait I'm giving u the link , ... pardon me for late reply.
Let me know about the link…
@@alzenodoe5765 I think that is a linear approximation. The relationship among these variables is extremely non-linear, and is based on the Antoine equation for the temperature vs pressure equation of water's boiling point. This is why you either use the chart, or a program with the functions built-in (as I do with EES), rather than calculating the formulas by hand.
I just explored this, given the case of 100kPa and 50% relative humidity. I'm assuming T1 = dew point, T2 = wet bulb, and T = dry bulb in your formula. If that's the case, the value of G was nowhere near constant, when I swept T from 0C to 40C
very good 👍