Effect of contact angle on capillary pressure
WebApr 4, 2024 · What is capillary pressure? P c is the resistant force to hydrocarbon migration. It is a function of the interfacial tension (γ), the wettability (Θ), and pore throat radius (r). P c increases with decreasing pore throat size, increasing interfacial tension, and increasing contact angle (greater oil wetting). It can be expressed as follows: WebIt is important to have a contact angle significantly smaller than 90 degrees, as the capillary pressure becomes insignificant when approaching 90 degrees, and a single imperfection in the microchannel can lead to local …
Effect of contact angle on capillary pressure
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WebOct 19, 2011 · A mathematical model is developed to predict the effect of motion of a liquid plug in a capillary tube on the dynamic contact angles including the effects of driving pressure, liquid plug length, tube diameter, and operating temperature. Results show that the advancing contact angle significantly affects the flow resistance of the liquid plug … WebThe capillary pressure characteristics of a given reservoir will impact the choice of recovery method (s) and displacement mechanisms. For instance, the displacement of oil by water in a water-wet reservoir requires a totally …
WebThe macroscopic capillary pressure that drives initial film thinning has been corrected for the local capillary pressures in the menisci around the particles adsorbed in lamella films. It has been found that the latter varies with contact angle (θ) and particle size. WebNov 12, 2024 · The contact angle had a great effect on the overall capillarity in micro-grooves. The more hydrophilic the surface, the higher the capillary rise, and Smaller …
WebApr 12, 2024 · At the contact angle of 30°, the coal surface is hydrophilic for the positive effect of capillary pressure, causing water to flow slowly along the coal surface and gas can be easily trapped in complex pore networks, which negatively affects the water flow (Fig. 10 a). While the coal surface repels water for the negative capillary pressure when ... WebSolution. The relation between capillary effect and contact angle is explained below: If the contact angle is less than 90 ° the surface becomes wet by liquid. If the contact angle …
WebApr 12, 2024 · Due to the dependence of the capillary pressure on the contact angle (Eq. ), an increase in the dynamic contact angle leads to a decrease in the capillary pressure, while the capillary force does not change when considering the static contact angle, as shown in Fig. 5b. The variation in the liquid transport velocity causes the contact angle …
WebJun 15, 2024 · 1 Introduction. Capillary pressure affects the distribution of natural gas and water as well as the relative permeability of gas and water in the reservoir (Wang and Gupta 1995 ), which has a great effect on gas reservoir recovery. The contact angle and interfacial tension are the key parameters that affect the capillary pressure. praxis dr leyer dortmundWebJan 19, 2016 · A drop of water resting on a solid, with a contact angle greater than 90°. Gas does not penetrate the medium in Fig. 1 until the capillary pressure exceeds the … praxis dr link offenburgWebh is the height of the liquid inside the capillary tube relative to the surface of the liquid outside the tube, T is the surface tension of the liquid, θ is the contact angle between the liquid and the tube, r is the radius of the tube, ρ is the density of the liquid, and; g is the acceleration due to gravity, 9.8 m/s 2. scientific revolution of asiaWebIf a capillary tube is placed vertically into a liquid, as shown in Figure 8, capillary action will raise or suppress the liquid inside the tube depending on the combination of substances. The actual effect depends on the relative strength of the cohesive and adhesive forces and, thus, the contact angle θ given in the table. praxis dr. lipke bad buchauWebJan 22, 2024 · Following the theoretical approach proposed in [3], for sufficient measured data from the geometry of a real capillary bridge, the associated meridional profile can be recovered from the solution of the Young-Laplace equation based on an inverse problem.The measured data includes the neck radius y ∗, the contact angle θ r, and the … scientific revolution related peopleWebSep 1, 2016 · These variations in capillary pressure curve due to contact angle alteration, are in good agreement with experimental study of contact angle effect on capillary pressure curve (Morrow, 1976). Morrow ( Morrow, 1976 ) experimentally studied effects of wettability on capillary pressure curve, air and an assortment of pure fluids without … praxis dr linzbach bad vilbelWebFeb 12, 2024 · Updated on February 12, 2024. Surface tension is a phenomenon in which the surface of a liquid, where the liquid is in contact with a gas, acts as a thin elastic sheet. This term is typically used only … praxis dr littwitz