Week 07 of 15 – Terms	Name: Answer Sheet

In your own words, write a definition for each of the following terms. Plagiarism will be checked and not tolerated.

Points: 5 pts/each = 8 * 5 = 40 pts

Flow rate

1. The actual speed or velocity of flow movement. 2. The time rate of motion of a fluid (usually contained in a pipe or duct), expressed as fluid quantity per unit time. [ISA-37.1-1975 (R1982)] 2. The quantity of fluid that moves through a pipe or channel within a given period of time.

scfm

Standard cubic feet per minute (SCFM) is the volumetric flow rate of a gas corrected to "standardized" conditions of temperature and pressure thus representing a fixed number of moles of gas regardless of composition and actual flow conditions.

acfm

Actual cubic feet per minute (ACFM) is a unit of volumetric capacity. It is commonly used by manufacturers of blowers and compressors.

Steady state

1. System response as time approaches infinity. 2. A characteristic of a condition, such as value, rate, periodicity, or amplitude that exhibits only negligible change over an arbitrarily long period of time. Note: Steady state may describe a condition in which some characteristics are static, others dynamic. [ANSI/ISA-51.1-1979 (R1993); ANSI/ISA-77.42.01-1999] 3. A system in equilibrium, when all the potential opposing forces are at rest or balanced. In fiber optics, equilibrium mode distribution.

Differential pressure, orifice plate

1. A disk or plate like member with a sharp-edged hole in it that is used in a pipe to measure flow or reduce static pressure. 2. The calculation of fluid flow rate by reading the pressure loss across a pipe restriction is perhaps the most commonly used flow measurement technique in industrial applications. The pressure drops generated by a wide variety of geometrical restrictions have been well characterized over the years, and, these primary or "head" flow elements come in a wide variety of configurations, each with specific application strengths and weaknesses. Variations on the theme of differential pressure (d/p) flow measurement include the use of pitot tubes and variable-area meters (rotameters), and are discussed later in this chapter.

Omega Engineering. (n.d.). Flow & Measurement. Retrieved March 10, 2016, from Transactions, Volume 4: http://www.omega.com/literature/transactions/volume4/t9904-07-diff.html

Pitot tube

1. An instrument for measuring the stagnation pressure of a flowing liquid. It consists of an open tube that points upstream into the flow of fluid and is connected to a pressure indicator or recorder. 2. An instrument that will register total pressure and static pressure in a gas stream. It is used to determine the gas stream’s velocity.

Rotameter

A variable-area, constant-head, indicating-type rate-of-flow volume meter in which fluid flows upward through a tapered tube, which lifts a shaped plummet to a position such that upward fluid force just balances the weight of the plummet.

Newton’s 2nd Law

Newton's second law of motion pertains to the behavior of objects for which all existing forces are not balanced. The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.