Publication

Flow Boiling of Ammonia in Smooth and Enhanced Horizontal Tubes.

Daniel Favrat
1997
Reports

Abstract

Experimental test results for flow boiling of pure ammonia inside horizontal tubes were obtained for a plain tube and a microfin tube. Tests were run at a nominal saturation temperature of 4°C, mass velocities from 20-140 kg/m2s, vapor qualities from 1-99% and heat fluxes from 7-58 kW/m2. The results showed substantial heat transfer augmentation for the microfin tube at mass velocities below 80 kg/m2s while little or no augmentation was observed at higher mass velocities. Two-phase pressure drops for the microfin tube were typically about 50% higher than for the plain tube at similar test conditions.

Official source

https://infoscience.epfl.ch/entities/publication/0597bd72-ab98-46e7-ad0e-bc1e0fcbd3df

About this result

This page is automatically generated and may contain information that is not correct, complete, up-to-date, or relevant to your search query. The same applies to every other page on this website. Please make sure to verify the information with EPFL's official sources.

Graph Chat

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

Daniel Favrat
1997
Reports

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/0597bd72-ab98-46e7-ad0e-bc1e0fcbd3df

About this result

Related concepts (32)

Proper velocity

In relativity, proper velocity (also known as celerity) w of an object relative to an observer is the ratio between observer-measured displacement vector and proper time τ elapsed on the clocks of the traveling object: It is an alternative to ordinary velocity, the distance per unit time where both distance and time are measured by the observer. The two types of velocity, ordinary and proper, are very nearly equal at low speeds. However, at high speeds proper velocity retains many of the properties that velocity loses in relativity compared with Newtonian theory.

Mass in special relativity

The word "mass" has two meanings in special relativity: invariant mass (also called rest mass) is an invariant quantity which is the same for all observers in all reference frames, while the relativistic mass is dependent on the velocity of the observer. According to the concept of mass–energy equivalence, invariant mass is equivalent to rest energy, while relativistic mass is equivalent to relativistic energy (also called total energy).

Escape velocity

In celestial mechanics, escape velocity or escape speed is the minimum speed needed for a free, non-propelled object to escape from the gravitational influence of a primary body, thus reaching an infinite distance from it. It is typically stated as an ideal speed, ignoring atmospheric friction. Although the term "escape velocity" is common, it is more accurately described as a speed than a velocity because it is independent of direction.

Related publications (8)

Flow Boiling of Ammonia in Smooth and Enhanced Horizontal Tubes.

Chat with Graph Search

Experimental Evidence of High-Acceleration Influence on Friction Force in Tangential Contacts

EXPERIMENTAL STUDY ON FLOW BOILING HEAT TRANSFER OF MULTIPORT TUBES WITH R245fa AND R1234ze(E)

Application of Photoluminescent Measurement Techniques for Quantitative Assessment of Turbine Film Cooling