According to Bernoulli's law, the narrower the tube where the fluid is flowing the lower its static pressure and the higher its dynamic pressure. Does this make any difference? If the dynamic pressure increases when the static decreases, then nothing changes at all. So what happens then?
If the pressure decreases in narrower tubes, why is the refrigerator's evaporator thicker than the condenser if we want it to be at lower pressure to absorb heat? If it increases in narrower tubes, how does the air in carburetors suck fuel if it was lower in pressure than the air?