It is the period of time that a power supply’s output remains within the prescribed voltage ranges after its input has been turned off or disconnected. Holdup time is merely a certain non-equilibrium condition of residence time, according to that definition.
How do you calculate hold up time?
The formula for calculating the needed capacitance for hold-up time is shown below. The value of the external capacitor (Cbc) may be estimated using the following formula. 1) The efficiency () and minimum input voltage for regulated output voltage (Vh) of the TUHS10F05 are both provided in the test data for this device. P’s efficiency (measured in terms of load current)
What is meant by liquid holdup?
[′likwd ′hldp] [′likwd ′hldp] (Mechanics of fluids) Slippage is a situation that happens in two-phase flow in a vertical pipe when the gas has a larger linear velocity than the liquid. Slippage results in liquid holdup and gas holdup.
How do you calculate liquid holding up?
The nondimensional area of the liquid film (the ratio of the area of the liquid film to the cross-sectional area of the pipe) was 0.29, and the nondimensional area of the liquid film was 0.29. Because the liquid holdup is defined as the area of the liquid divided by the area of the pipe, the nondimensional area is equal to the liquid holdup of the liquid film before the slug is introduced.
Where can I find liquid holdup?
There are numerous ways to detect liquid holdup experimentally, including using resistivity or capacitance sensors, or by trapping a piece of the flow stream between quick-closing valves and measuring the volume of liquid trapped. It is not possible to compute the liquid holdup using analytical methods.
What is hold up capacitor?
Since the hold-up capacitor receives its charge from the rectifier output through the extremely low resistance of the rectifier and alternating current line, as it charges, the voltage across the capacitor tracks the rectified line voltage (Fig. 1). The capacitor is subsequently discharged through the power converter that is supplying the load with electricity.
What is liquid hold up in packed column?
The volume of liquid held per volume of the packed bed during operating circumstances is characterized as liquid holdup (Górak and Schoenmakers, 2014), and it is measured in milliliters. There are two basic techniques to defining the liquid holdup of a packed column: a channel model and a particle model. A channel model is used to describe the liquid holdup of a packed column.
What is liquid holdup in multiphase flow?
Regarding multiphase flow in pipes, the proportion of a given fluid present in an interval of a pipe is defined as follows: In multiphase flow, each fluid flows at a different pace as a result of differences in gravitational forces and other variables, with the heavier phase flowing slower or being more held up than the lighter phase, as seen in the diagram below.
What is superficial liquid velocity?
1. n. [Production Logging] The velocity of a fluid travelling through a pipe, defined as the volumetric flow rate of that fluid divided by the cross-sectional area of the pipe. 2. n. [Production Logging] If the fluid is moving at a constant rate, this value is equal to the mean velocity of the fluid.