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vortex

In fluid dynamics, a vortex (plural vortices/vortexes) is a region in a fluid in which the flow revolves around an axis line, which may be straight or curved. Vortices form in stirred fluids, and may be observed in smoke rings, whirlpools in the wake of a boat, and the winds surrounding a tropical cyclone, tornado or dust devil.
Vortices are a major component of turbulent flow. The distribution of velocity, vorticity (the curl of the flow velocity), as well as the concept of circulation are used to characterise vortices. In most vortices, the fluid flow velocity is greatest next to its axis and decreases in inverse proportion to the distance from the axis.
In the absence of external forces, viscous friction within the fluid tends to organise the flow into a collection of irrotational vortices, possibly superimposed to larger-scale flows, including larger-scale vortices. Once formed, vortices can move, stretch, twist, and interact in complex ways. A moving vortex carries some angular and linear momentum, energy, and mass, with it.

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  1. A

    Does Grant Vortex 15/26 suck oil?

    My oil boiler is 2009 vintage. Just been serviced. Had a new tank fitted by approved fitter. I notice that the bottom of the tank is roughly on the level of the boiler feed pipe. Then I notice in the Grant instal manual for a single pipe feed the tank should be 300mm min above the boiler feed...
  2. J

    Grant Vortex Blue no power to CH pump

    Hi, I have an issue with my Grant Vortex internal combi boiler. Specifically the electrical side. Everything was working fine (with a dual channel Hive system) but then the central hearing stopped working. When looking it seemed like there were a number of loose contacts as when we moved the...
  3. R

    Grant Vortex 21 - lukewarm water but hot central heating

    Evening everyone, We've been having some issues with hot water coming from our Grant Vortex 21 boiler (external, oil fired, no cylinder) Water has been getting progressively colder over the past couple of months to the point where the little one struggles to have a bath. The hot water pressure...
  4. C

    Grant Vortex Combi 21e no central heating

    Hi, I've recently put some heating/hot water pipes into the floor as there were exposed previously. On refit of the pipes i've gone to test the boiler functionality however, the central heating won't fire. The hot water works perfectly. There is no CH light on the boiler and the return...
  5. S

    How to connect a Saswell scu209led-tm1 output to a Grant Vortex boiler

    Hi Installed UFH Manifold, pump, Valve etc, connected to a Saswell scu209led-tm1 Connection Box. On the terminals marked "com" and "no" going to the Boiler. Which terminals on a Grant Vortex Boiler do these 2 connectors go too? Thanks in advance
  6. S

    Grant vortex eco oil boiler

    Recently needing to reset the little red button under the black cap on the boiler about 3 times a week. Always serviced annually. How can I stop this?
  7. J

    Run out of oil - lockout

    Hi all, I have recently run out of oil - the sensor in my kitchen is faulty so we’re completely empty. I’ve topped up my tank today to tide me over until delivery but my boiler (grant vortex eco wall hung) is still in lockout. I’ve read around and think I need to bleed the air from the system...
  8. J

    Grant vortex oil boiler thermostat temperature range

    I have a new Grant Vortex 15/26 oil boiler installed. It has a boiler thermostat with no numerical information, just a wedge graphic and covers about 1/3 of a turn. I wondered if anyone could give an indication of what the range of temperatures is likely to be (I don't want to set the boiler...
  9. N

    Grant Vortex 26 questions

    Hi guys, looking for some advise on my Grant Vortex 26. Had a big leak for the heat exchanger last year which ran down to the hot water pump and shorted it out. I replaced the pump with new and new olive on the offending pipe. But since then have a couple of issues. 1) The hot water tank sounds...
  10. P

    Advice on Grant Vortex Mag-One filter unit service required

    Hello all, I have a Grant Vortex Mag-One filter which is leaking from one of the three caps on the top of the unit, I think its the central black one(see Photo attached) I have some new o-rings ready and the service instructions (see attached Photo) but am not sure on a couple of items and hope...
  11. N

    Grant Vortex 26 combi boiler help!

    Hi all, new to this forum and hoping to find some advice on my Grant Vortex 26 external combi boiler, Basically the heat exchanger sprang a leak, dripping on to the terminal box of the hot water pump below causing a short. I replaced the pump and the fibre washers on the heat exchanger, problem...
  12. SimonG

    Grant Vortex Air Boiler

    Anybody had any experience with a grant vortex air? Apparently a grant blue flame heat only boiler linked to a air source heat pump. Customer wants one!
  13. B

    Vortex Circulators in open vented system

    Has anybody experience with installing a vortex type central heating circulator? Because of back pressure on stopping the motor on a Grundfos, I'm looking at this alternative design which doesn't seem to interfere with the free flow of water. However, I can only find a German manufacturer...
  14. J

    Grant Vortex Condensing Boiler air in fuel?

    hi I have a grant oil fired boiler that is approx 4 years old. Recently the burner has started locking out. If I press the reset button it will start and fire and heat enough water for a shower etc... but then locks out. Sometimes it will stay on for a couple of days and give hot water on demand...
  15. john hood

    Grant Vortex Combi 1e problem - CH but no CHW

    A few days ago, our boiler and local pipes began to vibrate when CH started up. Running a hot tap (to override CH) caused it to stop immediately. Suspected faulty CH pump maybe. Plumber took a look, that seemed to be the case and we ordered up a replacement pump. No sooner had he gone than we...
  16. M

    Flashing burner light on vortex pro combi 26e

    Anybody know what the flashing burner light means? Tried to find any fault codes can't find any. I think the pcb is faulty but want to double check before I fit one.
  17. N

    Grant vortex pro external 36e poor hot water

    Hi, I’m new to the forum but thought I’d sign up to try and get some help with a customers boiler. Bit of background on the boiler first. The house was renovated extensively with new bathrooms kitchen etc and the above boiler fitted 4 1/2 years ago approx, with no other work done inside or to...
  18. W

    Grant vortex overheat reset

    Hi, I have a grant vortex oil boiler that keeps tripping the overheat stat. It is not a Combi boiler and happens at anytime of the day/night. Can someone point me in the right direction please.
  19. A

    Sizing Grant Vortex Oil Fired Cond Boiler

    I am trying to self assess the new Condensor Boiler sizing for a 18 yrs old built. It's oil fired Firebird Reillo has packed in. It was a 19- 35KW rated non condensing boilerhouse unit. This is a large 3000sqft property with ground and first floor. Considering the first floor with 5 beds 3 loos...
  20. SJB060685

    Grant Vortex Combi No CH

    Hi Guys. Still new to oil breakdowns. Got a Grant Vortex not giving CH. MI’s say (as far as I’ve got) the NRV could be stuck open, it says CH return will be hotter than flow if that’s the case which it is but I’m unsure exactly why that would happen. Can someone explain to me why that is?
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