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Saturday, May 9, 2020 | History

2 edition of Effect of pressure on the rate of evaporation. found in the catalog.

Effect of pressure on the rate of evaporation.

Payam Rahimi

Effect of pressure on the rate of evaporation.

by Payam Rahimi

  • 167 Want to read
  • 16 Currently reading

Published .
Written in English


Edition Notes

Thesis (Ph.D.) -- University of Toronto, 2003.

The Physical Object
Pagination157 leaves.
Number of Pages157
ID Numbers
Open LibraryOL19732620M
ISBN 100612784126

The evaporation rate of water in a vessel was studied as a function of of temperature, humidity, air velocity, and diameter of the vessel. The atmospheric temperature was varied between 14 and 29 °C, the humidity between 24% and 75%, the air velocity between and m/s, and the diameter between and cm. The experimental results are compared with a theory that is based on the Cited by: The rate of evaporation in an open system is related to the vapor pressure found in a closed system. If a liquid is heated, when the vapor pressure reaches the ambient pressure the liquid will boil. The ability for a molecule of a liquid to evaporate is based largely on the amount of kinetic energy an individual particle may possess. Even at.

@article{osti_, title = {Effect of lubricant on spray evaporation heat transfer performance of Ra and R in tube bundles}, author = {Moeykens, S A and Pate, M B}, abstractNote = {This study evaluates the effects of lubricant on spray evaporation heat transfer performance. Tests were conducted with refrigerant Ra and triangular-pitch tube bundles made from enhanced-condensation. High pressure on a water surface reduces the rate of evaporation. Storms are examples of high-pressure systems that slow down evaporation. At a high humidity, the rate of evaporation is also low. A high rate of airflow increases evaporation. Large surface areas also facilitate evaporation.

The evaporation rate is the factor determining how fast or slow a liquid evaporates, this depends on the temperature the surface area of the liquid, the strength of air currents above the liquid.   Evaporation starts when the top layer of a fluid touches the air. There are, however many circumstances that affect the rate of evaporation. Evaporation is “the change from a liquid state to a vapor phase” (“Evaporation Summary”). There are seven circumstances that change the rate of evaporation.


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Effect of pressure on the rate of evaporation by Payam Rahimi Download PDF EPUB FB2

In this study, the effect of atmospheric pressure on evaporation was examined. In this study, daily atmospheric pressure and evaporation data observed in the Ercan Meteorological Station located.

If a liquid of vapor pressure P is spilled the rate of evaporation is given as: () N = k a P A R T where N is the molar flux (mols/sec), P is the vapor pressure (Pa), k a is the mass-transfer coefficient under the prevailing wind or ventilation conditions (m/s), R is the gas-phase constant ( Pa-m 3 /mol-K), and T is the air.

Liquids and gases are made up of molecules. For noble gases (helium, neon, etc.) these molecules are just atoms, but I'll just refer to molecules.

Think of those special cases as monoatomic molecules. The molecules are constantly moving around. report is general, and for any given rate of evaporation from pure water, Effect of pressure on the rate of evaporation. book effect of salinity on evaporation and the attendant temperature rise can be determined on the basis of measurements of air and water temperatures, humidity, and atmospheric pressure.

INTRODUCTIONCited by:   Evaporation of water is nothing but escape of water particles into air as the atmospheric pressure is less,it is easier for the water particles to escape and greater is the rate of low pressure aids the evaporation and vice verse.

However, the rate of evaporation forms depends on external variables such as temperature, humidity and wind speed. Generally, when temperature and humidity are constant, and wind speed increases, the rate of evaporation increases as well. When temperature and wind speed are constant, but humidity increases, the rate of evaporation will decrease.

This study is on the effect of salinity on evaporation from water bodies and probable influence on the water cycle. Five different salts were used in this study, different concentrations of.

(b) If the container is sealed, evaporation will continue until there is enough vapor density for the condensation rate to equal the evaporation rate. This vapor density and the partial pressure it creates are the saturation values.

They increase with temperature and are independent of the presence of other gases, such as air. What is a vapor pressure deficit. How does wind sustain lake evaporation. What cause lake effect snow. evaporation. Evaporation.

is the net loss of water from a liquid surface that results from a phase change from a liquid to a vapor. It is a net process because water vapor is constantly.

EXAMPLE Single effect evaporator: steam usage and heat transfer surface A single effect evaporator is required to concentrate a solution from 10% solids to 30% solids at the rate of kg of feed per hour. If the pressure in the evaporator is 77kPa absolute, andFile Size: KB. first effect is at P.

1 = 1 atm abs pressure, the last effect will be under vacuum at a pressure P. Backward-feed multiple-effect evaporators. In the backwardfeed operation shown in Fig.3 for a triple- effect evaporator, the fresh - feed enters the last and coldest effect and continues on until the concentrated product leaves the first File Size: 90KB.

Effect of Change of Pressure: Wind Speed: The rate of evaporation of a liquid increases with increasing wind speed. Cooling caused by evaporation: The cooling caused by evaporation is based on the fact that when a liquid evaporates, it draws or takes the latent heat of vaporization from ‘anything’ which it touches.

Most of the book. Evaporation accounts for 90 percent of the moisture in the Earth’s atmosphere; the other 10 percent is due to plant transpiration. Substances can exist in three main states: solid, liquid, and gas. Evaporation is just one way a substance, like water, can change between these states.

Melting and freezing are two other ways. How temperature affects the rate of evaporation, class 9 Science. Second, heat in the nearby atmosphere increases evaporation because warmer air is able to hold more water vapor.

Evaporation, a necessary component of the Earth's water cycle, takes place when a substance changes states of matter from a liquid into a gas.

Several factors affect the rate of evaporation, and temperature is one of the major ones. Abstract --Introduction --Effect of salinity on saturation vapor pressure --Effect of salinity on evaporation --Comjparison with data obtained by Adams.

Series Title: Studies of evaporation. It increases it. Water evaporates or sublimates into the air based on the energy available. As you move further away from the boiling point the amount of evaporation decreases. It further decreases when you increase the amount of water vapor in the air.

The drier the air the more readily available it is to take water molecules. We can see and experience this when we look at the humidex. The basic factors that affect the rate of evaporation are the: rate at which heat can be transferred to the liquid, quantity of heat required to evaporate each kg of water, maximum allowable temperature of the liquid, pressure at which the evaporation takes place, changes that may occur in the foodstuff during the course of the evaporation process.

Consider the rates of evaporation and condensation. The rate of evaporation is set by the temperature, which is 20°C, while the rate of condensation is zero in panel (a) since the vapor pressure is zero. Since the rate of evaporation is greater than the rate of condensation, there will be a net movement of liquid water to water vapor.

So, evaporation is a cooling process and provides cooling effect on evaporating objects. The driving force for evaporation is vapor pressure gradient. The resistant created by soil and wind also affect the process of evaporation. Factors affecting rate of evaporation.

All liquids evaporate if exposed to certain elements. The rate at which a liquid evaporates depends on its molecular structure.

The other factors that affect evaporation are surface area, temperature and air movement. You can do a few fairly simple experiments to demonstrate the effect that the various factors have on the rate of evaporation.From the vapor pressure diagram, to get.

P. v = Torr, we need to heat Al to °C. • At this temperature, the mass evaporation rate is: • If the vapor pressure is chosen to be Torr, then the temperature has to be increased to °C and the evaporation rate becomes: cm s gr 10 cm s gr 10 27 2 Γ = × −2 File Size: 1MB.This effect will slow the evaporation down quite a a lot because the evaporation rate is proportional to the difference between the vapor pressure and the partial pressure of the substance, and diffusion can only take water away so fast.