Wetting Kinematics

Tensi, H. M.

doi:10.1007/978-3-662-01596-4_5

Cited by 17 publications

(11 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Authors [4] who observed similar effect during quenching in water solutions of polymers explained such strange behavior of surface temperature by varying thickness of the polymeric insulating layer which is clearly seen on the Fig. 1 [7]. Let's consider more attentively results of accurate testing of low concentration of polyoxyethylene in water.…”

Section: Methods Of Testing Polyoxyethylene Water Solutions and Resultmentioning

confidence: 76%

See 1 more Smart Citation

New Approach in Modifying Quenching Processes Based on Possibility of Controlling Steel’s Surface Temperature by Insulating Layer

Kobasko¹

2018

EUREKA: Physics and Engineering

View full text Add to dashboard Cite

In the paper is shown a possibility to govern surface temperature of steel parts during quenching by controlling the thickness of the insulating layer. That results in developing the new quenching technologies like austempering process via cold liquids. The investigations were performed with a low concentration of the polyoxyethylene in cold water using 20 mm cylindrical probe instrumented with two thermocouples. It is established that with the increase concentration of polyoxyethylene in cold water (beginning from 0.001 %) different heat transfer modes are observed resulting in the elimination of film boiling process at 0.001 % concentration, increasing surface temperature of probe during self-regulated thermal process, periodical changing of heat flux densities, slow cooling of surface temperature like in oil when concentration reaches 1 % polyoxyethylene in water, and so on. It is underlined that low concentration of polyoxyethylene in water can serve as an excellent quenchant for accelerated and uniform cooling of steel parts decreasing by this way the cost of a coolant. In this case accelerated cooling should be interrupted at proper time to provide optimal hardened layer afterr quenching. Such approach guarantees increasing service life of steel parts after accelerated cooling with the significant decrease of their cost and eliminates carburization process, The technology can be used for hardening large steel parts like large wind mill gears, large bearing rings, etc.

show abstract

Section: Methods Of Testing Polyoxyethylene Water Solutions and Resultmentioning

confidence: 76%

“…Author of [7] showed that insulating polymeric layer forms immediately after immersion of the cylindrical probe into water polymer solution of inverse solubility ( Fig. 1).…”

Section: Materials Sciencementioning

confidence: 99%

New Approach in Modifying Quenching Processes Based on Possibility of Controlling Steel’s Surface Temperature by Insulating Layer

Kobasko¹

2018

EUREKA: Physics and Engineering

View full text Add to dashboard Cite

show abstract

“…At this time, the local workpiece surface is wet by the quenching liquid. The nucleate boiling stage is followed by the convective heat transfer stage [6][7][8][9]. All three stages can co-exist on different workpiece surface areas at the same time.…”

Section: Introductionmentioning

confidence: 99%

Wet-state Ultrasonic Measurements of Cylindrical Workpieces during Immersion Cooling

Stoebener¹,

Goch²

2006

Mat.-wiss. u. Werkstofftech.

View full text Add to dashboard Cite

An ultrasound system was developed for recording the temporally and spatially resolved wetting behaviour of workpieces immersed in oil as quenching medium. The system is based on the measurement of the echo amplitude, reflected from the vapour blanket, the workpiece itself or the vapour bubbles, which occur in the nucleate boiling stage. An optically transparent oil was chosen for the experiments, so that the quenching process could be recorded with a standard CCD-camera in order to create reference data. The comparison of the duration of the vapour blanket stage calculated from the ultrasonic and the reference data shows a good agreement with respect to the measurement uncertainty. Therefore, the ultrasonic system is applicable in liquid quenching media.Keywords: wetting behaviour, ultrasound, quenching, heat treatment, SFB 570Zum zeitlich und räumlich aufgelösten Erfassen des Benetzungsverhaltens von Werkstücken beim Tauchkühlen in Ö l wurde ein Ultraschall-Messsystem entwickelt. Das System basiert auf der Messung der Amplitude des Ultraschallsignals, das vom Siedefilm, dem Werkstück oder den beim Blasensieden entstehenden Dampfblasen reflektiert wird. Für die Experimente wurde ein optisch transparentes Ö l verwendet, so dass mit einer Standard-CCD-Kamera Referenzaufnahmen des Abschreckprozesses aufgenommen werden konnten. Der Vergleich der Längen der Filmsiedephase, ermittelt mit dem Ultraschall-und dem Kamerasystem, zeigt eine gute Ü bereinstimmung im Rahmen der Messunsicherheit. Das Ultraschallsystem ist daher für die Messung in flüssigen Abschreckmedien geeignet.

show abstract

“…A rewetting process for a heated cylindrical test specimen which was submerged in water is shown in Figure 2 (Tensi & Lainer, 1997;Tensi, 1991;Tensi et al, 1995). Because of the different wetting phases on the metal surface (and the enormous differences of their values of αFB, αNB, and αCONV) the time dependant temperature distribution within the metal specimens will also be influenced by the velocity and geometry of the wetting front (for example, circle or parabolic-like) as well as geometry of the quenched part.…”

Section: Wwwintechopencommentioning

confidence: 99%

“…2. Cooling process illustrating the transition of the three cooling mechanisms -film boiling (FB), nucleate boiling (NB), convective cooling (CONV) -during immersion cooling of a cylindrical 25 mm dia × 100 mm CrNi-steel test specimen quenched from 850°C into water at 30°C with an agitation rate of 0.3 m/s (Tensi, 1991).…”

Section: Wwwintechopencommentioning

confidence: 99%

Experimental and Computational Study of Heat Transfer During Quenching of Metallic Probes

Hernández-Morales¹,

Vergara–Hernández²,

Solorio-Díaz³

et al. 2011

Evaporation, Condensation and Heat Transfer

View full text Add to dashboard Cite

Wetting Kinematics

Cited by 17 publications

References 11 publications

New Approach in Modifying Quenching Processes Based on Possibility of Controlling Steel’s Surface Temperature by Insulating Layer

New Approach in Modifying Quenching Processes Based on Possibility of Controlling Steel’s Surface Temperature by Insulating Layer

Wet-state Ultrasonic Measurements of Cylindrical Workpieces during Immersion Cooling

Experimental and Computational Study of Heat Transfer During Quenching of Metallic Probes

Contact Info

Product

Resources

About