21. Countercurrent exchange helps you to save energy.22. The countercurrent separation starts with choosing an appropriate biphasic solvent system for the desired separation. 23. But there are countercurrents in liberalism. 24. Countercurrent multiplication has been found in the kidneys as well as in many other biological organs.25. The exchange of heat in this diagram ( 1 ) is an example of countercurrent exchange. 26. The countercurrent motion of the slurry flowing down and the air flowing up provides mixing action. 27. A crosscurrent countercurrent air-to-air heat exchanger built with a humidity permeable material. 28. "Don't be afraid to go countercurrent ! " he exhorted his listeners. 29. Countercurrent centrifuges were developed after the war, and today are the favored method in many countries.30. Countercurrent systems are effective on petroleum products with molecular weights lower than No . 2 fuel oil.
