Analysis and comparison of the influence of rib design on flow velocity in the 1st, 2nd and 3rd generation of KONO coffee filter cup

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Hand coffee filter cup is very knowledgeable! Flow rate data of several common coffee filter cups

My impression is that in the summer of 2013, I accidentally opened a magazine called "filter cups" in the side of a friend. One page talked about the comparison of the differences between different filter cups. Because the content is in Japanese, I don't know much about it.

Until 2014, I read an article published by Uncle Coffee about hand-made coffee filter cup. The devil hides in the flow. It was only after that that I realized the main purpose of this article, and there was a truth after the actual experiment.

Therefore, I followed the coffee uncle's experiment to further analyze the effect of the inner ribs of the filter cup on the flow rate.

The main purpose of this experiment is to analyze and compare the influence of the overall flow velocity on the rib design of the third generation of KONO.

The parameters of the experiment are the same except for the filter cup.

Water: RO reverse osmosis water at room temperature

TDS:0.03ppm

Water volume: 250g

Filter paper: KONO MD-25 1x2 human bleached filter paper

Intelligent scale: ACAIA

Experimental method:

1. Put the lower seat on the intelligent scale, and the upper seat (filter cup) on the hand frame, which is separated from the lower seat.

two。 Fold the filter paper and put it on the filter cup and pour 250 grams of water into the filter cup covered with the filter paper at one time.

The condition that the filter cup fits with the filter paper after the Kono generation is drained. Let's take a look at the change in velocity:

From the picture above, the velocity curve of the total water accumulation in the upper way; the pressure curve is at the bottom.

According to the situation in the picture, at about 7 seconds, the pressure begins to drop, indicating that the flow rate is faster, while the water level falls right to the position of the ribs, and the time to completely drain is about 37 seconds.

On the icon, after the second generation of Kono is drained, the filter cup is attached to the filter paper. Let's take a look at the change in velocity:

According to the situation in the picture, like the first generation, the pressure begins to drop at about 7 seconds, and the time to drain completely is about 37 seconds.

On the icon, after the third generation of Kono is drained, the filter cup fits with the filter paper. Let's take a look at the change in velocity:

According to the situation in the picture, it is obviously different from that of the first and second generations. the pressure does not change obviously until 25 seconds, and the time of complete drain is about 35 seconds. It can be seen that the shortening and shallower ribs have a very obvious effect on the flow velocity.

Let me make a comparative analysis of the overlap of the velocity curves of the first to third generations:

Above, blue is the first generation, red is the second generation, and green is the third generation.

It can be seen that the situation of the first and second generation is very similar, but the flow rate of the third generation is much slower. The preliminary reason should be that the shape of the rib is obviously different from that of the first and second generation.

After that, we will open an article to analyze the flow velocity of other conical filter cups, and we should be able to determine more clearly what the influencing factors are.

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