How did the fluid flow change as you increased the radius of the flow tube?
If the tube radius is increased, then the laminar flow will increase.
How does changing the radius affect blood flow?
Therefore, blood flow is strongly proportional to the vessel radius. As the radius of the vessel lumen increases (called vasodilation), blood flow increases dramatically, and vice versa (1).
What do you think will happen to the flow rate if the radius is increased?
What do you think will happen to the flow rate if the radius is increased by 0.5 mm? The flow rate will increase.
What was the effect of increasing flow tube radius on flow rate and flow volume?
If the length of the vessel increases then the flow will decrease, but if the radius increases then the flow will increase. Blood flow increases, resistance decreases and the pump rate increases when the right flow tube radius is increased.
When the radius of the flow tube decreased?
46 Cards in this Set
| How does the body decrease the blood vessel radius? | vasoconstriction |
|---|---|
| When the radius of the flow tube is decreased, the _______. | fluid flow rate decreases |
What is the relationship between a change in the radius of a vessel and the flow volume through that vessel?
This relationship indicates that at a constant vessel radius, changes in flow are proportionate to changes in velocity, and visa versa. Another important relationship to be derived from above is that velocity, at constant flow, is inversely related to the radius squared (V ∝ 1 / r2 at constant flow).
What happens to blood flow when the vessel radius decreases?
It is important to note that a small change in vessel radius will have a very large influence (4th power) on its resistance to flow; e.g., decreasing vessel diameter by 50% will increase its resistance to flow by approximately 16 fold. Importantly, flow will only occur when a pressure difference exists.
What is the relationship between flow rate and radius?
Flow rate is directly proportional to the pressure gradient and the fourth power of the radius of the pipe.
Does flow rate decrease with radius?
The relationship between flow and vessel radius to the fourth power (assuming constant ΔP, L, η and laminar flow conditions) is illustrated in the figure to the right. This figure shows how very small decreases in radius dramatically reduces flow.
How does radius affect turbulent flow?
The reason for this is that flow (F) equals the product of mean velocity (V) times cross-sectional area (A), and area is proportionate to radius squared; therefore, the velocity at constant flow is inversely related to radius (or diameter) squared.
What did you notice about the flow rate as the vessel radius increased?
As the radius increases the flow will also increase.
What happens to flow rate if radius is halved?
Halving the radius decreases flow to 1/16th of the original value.