magicsound MFMP

Regarding the insulation issue, keep in mind that alumina becomes conductive starting at around 700°C. Any thermocouples in contact with the insulation will be affected when that happens. It can be mitigated by isolation of the measurement circuit, for…

(Quote from magicsound)

Looking at the temperature profile
of reactor shown in the report and modelling heat losses(output) as
radiative emission with an emissivity of 0.83 plus passive convection with a HTC of 4

the temperatures obtained …

RobertBryant Nicely done!

I suspect the discrepancy can be somewhat reduced by adjustment of the convective heat transfer coefficient. You used h = 4 which seems a bit low. In the example here 4.3 is used, and I've seen other examples using 5. The…

This is an important detail that I have considered carefully and commented on in other contexts. Below is a chart[1] of the correction factor to be applied to a conduction-type (Pirani) pressure gauge. These gauges depend on the thermal conductivity of…

(Quote from JedRothwell)


No, 200 °C as specified in step 13. The thickness of the steel will have a relatively small effect on the external thermcouple positioned directly over the core heater. This is because the thermal conductivity of 304 stainless…

Here' a progress report as of 7 November 2019.

The Mizuno R20 experiment is deceptively difficult, unlike what most casual commentators might think. The difficulty starts in these simple directions from Jed's summary:

"11. Close reactor and install in…

A large part of the apparent velocity decrease is due to the integrated ambient air temperature sensor in the anemometer tip being relatively far from the tip. So measurements with unheated air are no problem, but heated air does not impinge on the…

200 W input test/calibration going on now. Already 535 C in the core. 13.3 C air in, 25.4 C air going out.
Sorry no multi camera live stream. I’ll post some pics.
.

(Quote from Wyttenbach)

I am within 100 m of sea level elevation also.
I did account for temperature and normal sea level air pressure. That is where the discrepancy seems to come from.
Even humidity has little effect on air density below 30 C (increased…

Regarding the above plots of averages, note that the velocity is almost unchanged from 4.8 W to 6.0 W. The RPM, however, increases at about the usual rate relative to W. I suspect that the start of this flat spot is the peak mechanical efficiency of the…

During replication of the CAN electrolysis experiment earlier this year, I detected a RF signal at 228 MHz, shown below. This was probably from a stray LC resonance of the apparatus wiring, stimulated by the fast high current impulse from the sparker. I…

Just a thought. When the succesfull Mizuno meshes were handled after removal, I wonder if they were bent much, and if so, were they brittle?

(Quote from JedRothwell)


We discussed this back in July, when the R20 paper was first posted. Here's what I wrote in reply to Jed's earlier comment:

Mohs hardness refers to the scratch resistance - the ability of harder material to scratch softer material.…

My suspicion is that if transmutation occurred, it was induced by cavitation shock impacts on the material. The foil is 0.33 mm thick, with half-wave phonon resonance through the sheet of ~1.8 MHz. That is sufficiently above the ultrasonic stimulus that…

Here's a spectral plot for the ultrasonic cleaning device I used, showing a clear peak at 46 kHz. The recording used for analysis is 96 kHz 24 bit WAV, so the low pass sampling filter would be at 48 kHz - should be OK but just barely.

The samples of the super-productive mesh are on their way to analysis. Thank goodness. That wasn't easy to arrange.

(Quote from Wyttenbach)


The ultrasonic bath was ~1.5% Micro90 in DI water. It's a widely used cleaning product for lab ware and high vacuum components.
Upcoming repeats of the test will use pure DI water, and then with 10% D₂O added, while monitoring with…

I've posted a complete SEM/EDS report on the observed transmutation of Indium from ultrasonic cleaning.
https://bit.ly/2mExg52
It's a comprehensive document that will take some time to review. The first image on page 1 shows the crater about 2 mm wide that…

(Quote from Peter)

I just got home from Italy last night and did the usual unpack-and-sort-mail today. I will post the SEM/EDX images tomorrow. Further tests will be done later this week, to see if it's replicable.