2 wrote:
>>Unfortunately that isn't at all relevant to forced-air cooling, where
>>the airflow is very turbulent and the flow pattern is quite different.
>>
>â?¬ fasten seatbelts
>
>>Air is blasted at the upstream side of the tube, cooling it well, but
>>the flow breaks away from the surface half-way around to form a
>>turbulent wake.
>
>â?¬ Not with the quiet, slow speed fan in a SB-220, Ian..
>
All practical cooling fans create turbulence. It's easy to check with a
streamer of smoke.
>>The downstream side is only cooled by eddies in the
>>wake, and there may even be negative pressure on the opposite side.
>>
>>There is absolutely no doubt that cooling is less good on the downstream
>>side.
>
>â?¬ The colour of the ink on the 3-500Z glass does not indicate this.
>
Thank you - that's the information I was asking for. Can you confirm
that the ink is on the opposite side from the fan?
> >The only questions are: how much less good, and does it matter?
>>That's why I was looking for separate evidence whether the color of the
>>markings is dependent on the orientation of the tube.
>>
>â?¬ Denial of reality - the greatest glitch in the human psyche. Alas.
How very true for all of us. That's why I was asking for simple
information about what the reality IS, in the SB-220 and the L4-B.
73 from Ian G3SEK Editor, 'The VHF/UHF DX Book'
'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.com/g3sek
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