Effects of pulse power on evaporation characteristics of an n-heptane droplet in a microtube

Zhou, Xinyuan; Li, Junwei; Chen, Xinjian; Wang, Ningfei

doi:10.1016/j.applthermaleng.2023.120895

Cited by 1 publication

(1 citation statement)

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“…Leong et al [ 18 ] gave a critical review of the boiling model and bubble dynamics in the microchannel. Parjapati et al [ 19 , 21 ] reported the instabilities in micro channels and also described their promising features, whereas Cebi et al [ 20 ] worked on flow boiling in mini and microchannels for enhanced geometries. Both are time-consuming and expensive due to their design and operating techniques.…”

Section: Introductionmentioning

confidence: 99%

Flow Boiling of Liquid n-Heptane in Microtube with Various Fuel Flow Rate: Experimental and Numerical Study

Rashid,

Ahmad,

Swati

et al. 2023

Micromachines

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The evaporation of liquid hydrocarbon n-heptane is discussed in detail with experimentation and numerical techniques. A maximum wall temperature of 1050 K was reported during an experimental process with a two-phase flow that was stable and had a prominent meniscus at a small fuel flow rate (FFR) ≤ 10 µL/min. At medium to high FFR (30–70 µL/min), the flow field was unstable, with nucleating bubbles and liquid droplets inside the microtube and the maximum temperature recorded was 850 K for 70 µL/min. For the numerical model, the temperature of the wall was used as a boundary condition. Using the numerical model, the evaporative flux at the meniscus, pressure drop, pressure oscillation, and heat transfer coefficient (HTC) were investigated. A single peak in HTC was obtained at a low fuel flow rate, while multiple peaks were obtained for high FFR. At low FFR, the pressure peak was observed to be 102.4 KPa, whereas at high FFR, the pressure peak increased to 105.5 KPa. This shows a 2% increase in pressure peak with an increase in FFR. Similarly, when the FFR increased from 5 µL/min to 70 µL/min, the pressure drop increased from 500 Pa to 2800 Pa. The high amplitude of pressure drops and a high peak of HTC were found, which depend on the mass flow rate. The coefficient of variation for pressure drop depends mainly on the fuel flow rate.

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