Talk:Critical heat flux

Wikified as part of the wikification drive. KarenAnn 17:38, 25 June 2006 (UTC)[reply]

DNB

Isn't DNB the pre-CHF phenomenon where interference of bubbles means that flux no longer grows linearly (or supelinearly} with temperature?? ie the heat transfer coefficient, but not the flux, begins to decrease Bob aka Linuxlad 19:16, 24 April 2007 (UTC)[reply]

Linuxlad: I agree that there is a slight distinction between DNB and CHF, but I would describe it as a hydrodynamic definition vs. than a thermal one. DNB would be defined by the nature of the vapor flow (bubbles vs. film/column) while CHF obviously represents the highest heat flux obtained as a function of delta T. Most of the best visualization experiments aren't the best at measuring heat transfer coefficients and vise versa and we certainly don't have a good enough handle on the modeling of transition boiling yet to make such fine comparison yet. Thus, I agree with 138.250.194.13 that in practice these terms are pretty much used interchangeably to describe the start of the transition boiling regime. I think top priority for this article is a good delta T-q" diagram of the boiling process. Bdentremont (talk) 19:21, 6 August 2008 (UTC)[reply]

copy paste?

A number of different terms are used to denote the CHF condition: departure from nucleate boiling (DNB), liquid film dryout (LFD), annular film dryout (AFD), dryout (DO), burnout (BO), boiling crisis (BC), boiling transition (BT), etc. DNB, LFD and AFD represent specific mechanisms which will be introduced later.

The last sentence looks like it was a copy-paste from a book!! —Preceding unsigned comment added by 138.250.194.13 (talk) 10:48, 15 July 2008 (UTC)[reply]

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Inadvertently stilted

The text needs to present a more conventionally persuasive structure to avoid sounding Iike it’s a mishandled observation. Typically, boiling fluid heat transfer is more efficient precisely because the expanding gas separates from the surface creating turbulences that breaks up the lower efficiency boundary layer limited heat transfer regime. Aside from design problems that amount to “what if I drop the pressure and flash off the entire volume simultaneously” (whether normally working above the triple point or not) and “my water tubes are horizontal so they tend to gas plug” I can’t follow what’s being contemplated. If this is making micro-scale arguments, the surfaces shouldn’t be flat. If its making macro-scale arguments then localized heating needs a lot more definition. As it stands it sounds far too much like a crack-pot theory cooked up to create a marketable product differentiation that has no real merit. If so the page might be better removed than re-worked as an explicit explanation of a marketing gimmick - Wikipedia already tends to be overwhelmed by information with little intrinsic value. PolychromePlatypus (talk) 20:02, 29 April 2022 (UTC)[reply]

Zuber’s equation

Can someone please add a (couple of word) description of each of the elements of Zuber’s equation? From the following paragraph, I see C is Zuber’s Constant, but can’t figure out the others. Thank you! 2601:197:4300:3C80:593E:8591:B82D:2129 (talk) 10:26, 14 July 2022 (UTC)[reply]