Describe the graph of flow versus viscosity
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You must disable your pop-up blocker before exporting. The dose was too low. Viscosity is the measure of the internal friction of a fluid. Check out the numbers in the table accompanying the graph. To obtain the viscosity of the tested fluid multiply the reading of the viscometer by the spindle factor given in the manual of the viscometer. Determination of parameters of time dependent non-Newtonian fluids Usually, the analysis of thixotropic and rheopectic fluids involves plotting changes in viscosity as a function of time. Since there is no relationship between the two, the maxim that heavier fluids are more viscous is misleading.

Total blood flow is proportional to cardiac output. When sheared, however, they begin to disentangle and to allign which causes the viscosity to drop. Then, the slope of the line indicating the type and degree of non-Newtonian flow and its intercept with the x-axis indicating its yield value if any can be used as empirical constants. Shearing occurs whenever the fluid is physically moved by pouring, spreading, spraying, mixing, etc. You have not answered this question. If you double the viscosity it would be 4000, five times the viscosity would be 10,000, and 10 times stiffer would be 20,000. A change in fluid's viscosity over time indicates time-dependent behavior: a decrease means thixotropy, an increase rheopexy.

This information might aid in optimizing the processing conditions and the composition of plastics. The null hypothesis is accepted if the expected results do not occur. Data To copy your data from your online notebook into this section, click on Export Text and then copy and paste your data into this section. For those new to Scientific Molding, the viscosity curve is a plot of the viscosity of a polymer vs. The bigger the radius, the more laminar flow of fluid. Which mechanism had the greatest compensatory effect? The resumption of the heartbeat is referred to as vagal escape and can result of sympathetic reflexes or initiation of a rhythm by the parking fibers. Radius change is directly proportional on laminar flow.

When it was first presented in the late 1980s it was not well accepted, but some 20 years later it has gained a substantial foothold, perhaps to the point of being a bit overrated. The report must be typed in 12 pt. How well did the results compare with your prediction? There are only two sentences written. This is a downward curve. Stroke volume is also controlled by the strength and force of contractility of the heart. For a given viscosity, the viscous drag, or resistance to flow indicated by the degree to which the spring winds up , is proportional to the spindle's speed of rotation and is related to the spindle's size and shape. We learned earlier that an increase in red blood cells results in an increase in blood viscosity.

How well did the results compare with your prediction? Exploration Answer the following questions in fewer than 100 words: Activity 1: Normal Values of Cardiovascular Physiology 1. Thyroid-stimulating… Exercise 8: Chemical and Physical Processes of Digestion: Activity 1: Assessing Starch Digestion by Salivary Amylase Lab Report Pre-lab Quiz Results You scored 0% by answering 0 out of 6 questions correctly. At such locations, the water flow has a rotational component. Blood Viscosity can also have an affect on blood pressure, the more viscous thicker the blood is, the slower it will flow through the body. Data To copy your data from your online notebook into this section, click on Export Text and then copy and paste your data into this section.

Explain the effect that pressure changes had on flow rate. Measurements made using the same spindle at different speeds are used to detect and evaluate the rheological properties of the tested fluid. For pseudoplastic fluids the ratio exceeds 1. The heart can compensate for changes in peripheral resistance by decreasing blood viscosity and through adjusting the force of contraction of the heart. Lab Summary: Write a 100- to 200-word summary.

Line up all the shots in order, fast to slow or slow to fast. Hint: Look at the relationship of the variables in the equation. Explain the effect that the change in blood vessel length had on flow rate. How well did the results compare with your prediction? Viscosity can be thought of as a fluids resistance during deformation to shear or tensile stress, or in more simple terms, how easy or difficult it is to make a fluid flow. Once a straight line is obtained the angle this line forms with the y-axis is measured.

As we know, radius is directly proportional to flow rate in that as the radius increases so does the flow rate, therefore, the plotted graph has to be linear. From the table below, you can use the injection pressure at transfer and fill time to develop the viscosity curve. Why is adequate blood flow significant with respect to physical activity two points? For a given spindle geometry and speed, an increase in viscosity will be indicated by an increase in the deflection of the spring. Suppose the fluid is moving faster on the left than on the right. The apparent viscosity is defined by If we combine this expression with the Oswald equation, we obtain a second power-law equation for the apparent viscosity: A power law can also be used to describe the behavior of a dilatant shear-thickening liquid.