- Why are gills rich in blood?
- Do lungs use countercurrent exchange?
- What is counter flow cooling tower?
- What are the advantages of countercurrent flow?
- Why is countercurrent flow efficient?
- What is counter flow system?
- What is the principle of countercurrent exchange?
- Do humans use countercurrent heat exchange?
- What is the most effective heat exchanger?
- Under what conditions can a counter flow heat exchanger have an effectiveness of one?
- How does countercurrent flow work?
- What is countercurrent blood flow?
Why are gills rich in blood?
The water enters the mouth and passes through the feathery filaments of the fish’s gills, which are rich in blood.
These gill filaments absorb oxygen from the water and move it into the bloodstream.
At the same time, waste carbon dioxide in the blood passes out through the gills into the water..
Do lungs use countercurrent exchange?
Rather than using lungs, gaseous exchange takes place across the surface of highly vascularized gills. … Gills use a countercurrent flow system that increases the efficiency of oxygen-uptake (and waste gas loss).
What is counter flow cooling tower?
In a crossflow tower, air travels horizontally across the direction of the falling water whereas in a counterflow tower air travels in the opposite direction (counter) to the direction of the falling water. See Figure 1 and Figure 2 for a visual explanation.
What are the advantages of countercurrent flow?
The counter-current system is an advantage of the gas exchange system in fish. It allows maximum oxygen to be absorbed by the blood from the water, by maintaining the concentration gradient the whole way through the gills.
Why is countercurrent flow efficient?
Counter flow heat exchangers are inherently more efficient than parallel flow heat exchangers because they create a more uniform temperature difference between the fluids, over the entire length of the fluid path. … Each time a fluid moves through the length is known as a pass.
What is counter flow system?
counterflow system. the flow of water and blood in opposite directions across the gills of fish which ensures that blood meets water with the highest possible oxygen content. see COUNTERCURRENT EXCHANGE.
What is the principle of countercurrent exchange?
Countercurrent exchange is a mechanism occurring in nature and mimicked in industry and engineering, in which there is a crossover of some property, usually heat or some chemical, between two flowing bodies flowing in opposite directions to each other.
Do humans use countercurrent heat exchange?
Many animals (including humans) have another way to conserve heat. … Such a mechanism is called a countercurrent heat exchanger. When heat loss is no problem, most of the venous blood from the extremities returns through veins located near the surface.
What is the most effective heat exchanger?
Plate exchanger is the most efficient due to turbulent flow on both sides. High heat-transfer coefficient and high turbulence due to even flow distribution are important. However, a plate heat exchanger regenerator is restricted to low viscosities. With high viscosities, a special tubular may be required.
Under what conditions can a counter flow heat exchanger have an effectiveness of one?
When capacity ratio is equal to one and NTU value is very large then the counter flow heat exchanger will have an effectiveness of one i.e. 100% effectiveness.
How does countercurrent flow work?
Countercurrent oxygen exchange (shown in the figure above) means the blood flows through the gills in the opposite direction as the water flowing over the gills. … In contrast, countercurrent oxygen exchange allows the blood to pick up 90 percent of the oxygen in the water.
What is countercurrent blood flow?
Countercurrent Heat Exchange is a common mechanism in organisms that utilizes parallel pipes of flowing fluid in opposite directions in order to save energy. … As blood flows to the tip of the tongue, it heats up blood returning to the body.