Micro-ratcheted surfaces for a heat engine biomass conveyor

Krumm, Christoph; Maduskar, Saurabh; Paulsen, Alex D.; Anderson, Anthony D.; Barberio, Nicholas L.; Damen, Jonathan N.; Beach, Connor A.; Kumar, Satish; Dauenhauer, Paul J.

doi:10.1039/c6ee00519e

Cited by 11 publications

(6 citation statements)

References 24 publications

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“…This is an indication of a potential Leidenfrost effect, which might occur at even higher temperatures, as has previously been observed with other reacting solids. [45] The evolution of gas and bubbles serves to lift the sample above the plate. This phenomenon may also occur due to the high helium sweep rate (200 mL min À 1 ) used in Visual PHASR.…”

Section: High-speed Photography Of a Reacting Filmmentioning

confidence: 99%

On the Method of Pulse‐Heated Analysis of Solid Reactions (PHASR) for Polyolefin Pyrolysis

et al. 2020

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The continued need for plastics necessitates an effective solution for processing and recycling polymer wastes. While pyrolysis is a promising technology for polyolefin recycling, an experimental apparatus must be designed to measure the intrinsic kinetics and elucidate the chemistry of the plastics pyrolysis process. To resolve this issue, a modified Pulse-Heated Analysis of Solid Reactions (PHASR) system was designed, constructed, and evaluated for the purposes of polyolefin pyrolysis. Experimental results demonstrated that the new PHASR system is capable of measuring the millisecond-resolved evolution of plastic [e. g., low-density polyethylene (LDPE)] pyrolysis products at a constant temperature. The PHASR system was shown to be capable of producing a repeatable, fast heating time (20 ms) and cooling time (130-150 ms), and of maintaining a stable temperature during reaction. A second, Visual PHASR system was developed to enable high-speed photography and visualization of the real-time pyrolysis of LDPE.

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Section: High-speed Photography Of a Reacting Filmmentioning

confidence: 99%

On the Method of Pulse‐Heated Analysis of Solid Reactions (PHASR) for Polyolefin Pyrolysis

et al. 2020

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“…In the past, the environment with vacuum39 and/or high-temperature40 was used to build the condition of low-vacuum and/or low-humidity. Inspired by this, we attempted to fabricate local environment with low-vacuum and low-humidity by a frosting process.…”

Section: Resultsmentioning

confidence: 99%

“…To confirm this opinion, we fabricated the superhydrophobic coating by one-step spray methods from nano-chains, nano-spheres and nano-aggregates paints respectively for comparison of condensation performances. For another, self-propelling motion of isolated droplets or particles also could be triggered by unbalanced pressure394041. Thus, we designed a frosting-defrosting process to achieve local high-pressure under the frost crystal on the nano-chains coating for observation of the melting frost self-ejecting (MFSE) motion.…”

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confidence: 99%

Sprayable superhydrophobic nano-chains coating with continuous self-jumping of dew and melting frost

Wang

Zhang

et al. 2017

Sci Rep

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Spontaneous movement of condensed matter provides a new insight to efficiently improve condensation heat transfer on superhydrophobic surface. However, very few reports have shown the jumping behaviors on the sprayable superhydrophobic coatings. Here, we developed a sprayable silica nano-porous coating assembled by fluorinated nano-chains to survey the condensates’ dynamics. The dewdrops were continuously removed by self- and/or trigger-propelling motion due to abundant nano-pores from random multilayer stacking of nano-chains. In comparison, the dewdrops just could be slipped under the gravity effect on lack of nano-pores coatings stacked by silica nano-spheres and nano-aggregates. More interestingly, the spontaneous jumping effect also occurred on micro-scale frost crystals under the defrosting process on nano-chains coating surfaces. Different from self-jumping of dewdrops motion, the propelling force of frost crystals were provided by a sudden increase of the pressure under the frost crystal.

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“…In the case of the Leidenfrost ratchet, a Leidenfrost drop can even be made to climb a small incline or race around a maze following a predetermined path [88]. A small solid consisting of cellulosic particles [89] self-propelling on a Leidenfrost ratchet has also been found and represents an example of a biomass conveyor with no moving parts driven solely by high temperatures [90].…”

Section: Self-propulsionmentioning

confidence: 99%

Leidenfrost drop dynamics: a forgotten past and modern day rediscoveries

Stewart¹

2021

Eur. J. Phys.

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When drops of liquid are placed onto highly heated substrates at temperatures well above their boiling point, the drops float on a thin layer of vapour formed between the liquid and the hot surface. In a 290 year old phenomenon referred to as the Leidenfrost effect, drops freed from contact with the surface below can undergo a range of surprising and unexpected dynamical behaviour. In this paper we trace various early developments associated with the dynamics of Leidenfrost drops. By showing how many of the more recent discoveries found in the dynamic behaviour of Leidenfrost drops were either anticipated or antedated, we hope to draw attention to the long, rich, and largely overlooked history of the Leidenfrost effect and show there is much one can learn from its forgotten past.

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Micro-ratcheted surfaces for a heat engine biomass conveyor

Abstract: Biomass particles spontaneously self-propel in the direction of asymmetric ratchets above the reactive Leidenfrost temperature.

Cited by 11 publications

References 24 publications

On the Method of Pulse‐Heated Analysis of Solid Reactions (PHASR) for Polyolefin Pyrolysis

On the Method of Pulse‐Heated Analysis of Solid Reactions (PHASR) for Polyolefin Pyrolysis

Sprayable superhydrophobic nano-chains coating with continuous self-jumping of dew and melting frost

Leidenfrost drop dynamics: a forgotten past and modern day rediscoveries

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