BOILING WATER AND THREE IMMISCIBLE ORGANIC LIQUIDS OVER A SMALL TUBE BUNDLE AT ATMOSPHERIC PRESSURE

1986 ◽  
Author(s):  
H.H. Ahmad ◽  
P.J. Nelson ◽  
Bryce M. Burnside
Keyword(s):  
Atmospheric Pressure ◽  
Tube Bundle ◽  
Boiling Water ◽  
Organic Liquids ◽  
Small Tube

scholarly journals Experimental Verification of Impact of Sprinkled Area Length on Heat Exchange Coefficient

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Petr Kracik ◽  
Marek Balas ◽  
Martin Lisy ◽  
Jiri Pospisil
Keyword(s):  
Gas Phase ◽  
Flow Rate ◽  
Atmospheric Pressure ◽  
Tube Bundle ◽  
New Technology ◽  
Thin Liquid Film ◽  
Flow Mode ◽  
Heat Exchange Coefficient ◽  
Flowing Fluid ◽  
The Ideal

On a sprinkled tube bundle, liquid forms a thin liquid film, and, in the case of boiling liquid, the liquid phase can be quickly and efficiently separated from the gas phase. There are several effects on the ideal flow mode and the heat transfer from the heating to the sprinkling liquid. The basic quantity is the flow rate of the sprinkling liquid, but also diameter of the tubes, pipe spacing of the tube bundle, and physical state of the sprinkling and heating fluid. Sprinkled heat exchangers are not a new technology and studies have been carried out all over the world. However, experiments (tests) have always been performed under strict laboratory conditions on one to three relatively short tubes and behaviour of the flowing fluid on a real tube bundle has not been taken into account, which is the primary aim of our research. In deriving and comparing the results among the studies, the mass flow rate based on the length of the sprinkled area is used, thus trying to adjust the different length of the heat exchanger. This paper presents results of atmospheric pressure experiments measured on two devices with different lengths of the sprinkled area but with the same number of tubes in the bundle with same pitch and surface at a temperature gradient of 15/40°C, where 15°C is the sprinkling water temperature at the outlet of the distribution pipe and 40°C is the temperature of heating water entering the bundle.

Non-Condensable Gases Effect on Heat Transfer Processes Between Condensing Steam and Boiling Water in Heat Exchanger With Multirow Horizontal Tube Bundle

2010 ◽  
Author(s):  
A. V. Morozov ◽  
O. V. Remizov ◽  
A. A. Tsyganok
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Tube Bundle ◽  
Horizontal Tube ◽  
Boiling Water ◽  
Test Facility ◽  
Primary Circuit ◽  
Outer Diameter ◽  
Steam Condensation ◽  
Experimental Heat

The experimental investigations of non-condensable gases effect on the steam condensation inside multirow horizontal tube bundle of heat exchanger under heat transfer to boiling water were carried out at the large-scale test facility in the Institute for Physics and Power Engineering (IPPE). The experiments were carried out for natural circulation conditions in primary and secondary circuits of the facility at primary circuit steam pressure of Ps1 = 0.34 MPa. The experimental heat exchanger’s tube bundle consists of 248 horizontal coiled tubes arranged in 62 rows. Each row consists of 4 stainless steel tubes of 16 mm in outer diameter, 1.5 mm in wall thickness and of 10.2 m in length. The experimental heat exchanger was equipped with more than 100 thermocouples enabling the temperatures of primary and secondary facility circuits to be controlled in both tube bundle and in the inter-tubular space. The non-condensable gases with different density — nitrogen and helium were used in the experiments. The volumetric content of gases in tube bundle amounted to ε = 0.49. The empirical correlation for the prediction of the relative heat transfer coefficient k/k0 = f (ε) for steam condensation in steam-gas mixture was obtained.

scholarly journals XVIII.—On Steam and Brines

1900 ◽  
Vol 39 (3) ◽  
pp. 529-573
Author(s):  
J. Y. Buchanan
Keyword(s):  
Atmospheric Pressure ◽  
Barometric Pressure ◽  
Boiling Water ◽  
Common Salt ◽  
Coarse Powder ◽  
Abundant Supply

The immediate purpose of the present research was the investigation of the temperature at different pressures of boiling mixtures of steam and salts, analogous to the well-known freezing mixtures of ice and salt.When steam is blown through common salt in coarse powder, it condenses to water, which dissolves some of the salt, and the resulting brine is kept boiling by the arrival of more steam. The temperature of this boiling mixture is quite constant so long as there is an abundant supply both of steam and of salt, and as the atmospheric pressure does not change, it is about 8·5° C. above the temperature of boiling water when the barometric pressure is the normal of 760 mm. When the barometric pressure is 560 mm. this excess has fallen to 8·0° C. Most other salts behave in a similar way.

Boiling Heat Transfer on Small Diameter Tube Bundle

2010 ◽  
Vol 2 ◽  
pp. 41-52 ◽  
Author(s):  
Ebenezer Adom ◽  
Peter Kew ◽  
Keith Cornwell
Keyword(s):  
Heat Transfer ◽  
Atmospheric Pressure ◽  
Tube Bundle ◽  
Small Diameter ◽  
Heat Fluxes ◽  
Tube Bank ◽  
Central Column ◽  
The Heat Transfer Coefficient ◽  
Outside Diameter

An experimental study has been carried out using a tube bank representing a section of a tube bundle. The bank comprised 3 columns each of 10 stainless steel electrically heated tubes of 3mm outside diameter with pitch to diameter ratio of 1.5 in an in-line arrangement. Flow rate through the test section was controlled. Each tube in the central column was instrumented to permit determination of the tube temperature and heat flux, hence permitting calculation of the heat transfer coefficient. These tests were carried out using distilled water at nominal atmospheric pressure over a range of heat fluxes between 6 - 21 kW/m2. Results of the heat transfer tests are presented and compared with correlations used for conventionally sized bundles. Correlations developed for large tube bundle overestimate the experimental results.

scholarly journals IX. On the use of the barometric thermometer for the determination relative heights

1846 ◽  
Vol 136 ◽  
pp. 121-132
Keyword(s):  
Sea Level ◽  
Atmospheric Pressure ◽  
Boiling Point ◽  
Royal Society ◽  
Barometric Pressure ◽  
Boiling Water ◽  
The Alps ◽  
The Law

Although the observation of the temperature of boiling water has been for some time, but not extensively, employed for the determination of relative heights, yet the only means which experiment has confirmed of reducing it to a measure of the atmospheric pressure as usually estimated by the height of an equiponderate column of mercury has, till very recently, been overlooked; and it may perhaps be owing to this circumstance that the instrument for making the requisite observations remains to have fully developed in it the advantages it undoubtedly possesses, in portability and strength of construction, over the fragile and easily deranged barometer. My attention having been called to this subject by a remark made by Professor Forbes in his interesting work on the Alps, to the effect that he had found the temperature of boiling water to decrease uniformly with the increase in height of the place of observation, and at the rate of one degree of Fahrenheit for every 550 feet of vertical ascent, I considered that it would be highly satisfactory to verify this result during an excursion over the Alps of Savoy and Piedmont which I then had in contemplation, and in the course of which I proposed to visit some localities at very considerable elevations above the sea level: and I was induced also to seek for some foundation for this very simple law. In prosecuting the latter inquiry, I soon found that, by assuming the truth of De Luc’s formula for the determination of the boiling-point from the barometric pressure, at all accessible heights, a corroboration of the law in question is at once arrived at. I have since found, by reference to a paper in Vol. xv. of the Transactions of the Royal Society of Edinburgh, that Professor Forbes had himself verified his original conjecture in the same manner.

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