Viscous Activation Energy Research Articles

Experimental investigations on B2O3-Al2O3-SiO2 glass-ceramics with different K2O/Na2O ratios for sealing to Kovar alloy

This work studied the effects of the K2O/Na2O ratio on the viscosity of B2O3-Al2O3-SiO2 parent glass and the microstructure, physical, and chemical properties of the resulting glass-ceramics after heat treatment. Additionally, the effect of sealing temperatures on the sealing strength of glass-ceramics-to-Kovar was studied. The results show that the viscosity of parent glass increases with the increase in the R (R=n(K2O)/[n(Na2O)+n(K2O)]) value, and the viscous activation energy of BAS parent glass is about 262.65–293.85 KJ/mol. After heat treatment, the parent glass precipitates the main crystalline phase of Al0.52Zr0.48O1.74 (PDF#53–0294) and ZrO2 (PDF#37–1484). As the R value gradually increases, the thermal expansion coefficient of glass-ceramics initially decreases before increasing within the range of 44.74×10−7 to 52.29×10−7 ℃−1. The density follows a similar trend, fluctuating between 2.40 and 2.45 g/cm3. Meanwhile, the resistivity of the glass-ceramics steadily increases from 1×1012.07 to 1×1014.82 Ω·cm. Moreover, the resistivity of GcN-3 (R=1/2) sample remains excellent at high temperatures, maintaining 3.94×109 Ω·cm at 600 ℃. Subsequently，the BAS glass-ceramics sample GcN-3 (R=1/2) was sealed with Kovar alloy at temperatures range from 930 to 970℃. With the increasing of sealing temperature, the sealing strength increased from 0.51 to 2.10 MPa. In the process of sealing, with the increase of temperature, the iron in the Kovar alloy and the silicon in the glass-ceramics diffused to produce effective sealing and formed different sealing layers. The sealing area was observed to consist of four distinct regions: the matrix alloy, the alloy iron-deficiency area, the iron-rich glass-ceramics and the matrix glass-ceramics.

Effect of CaO/MgO on rheological properties and structure of CaO–MgO–SiO2–Al2O3-50 % TiO2 slag with SiO2/Al2O3=1.0

The rheological properties, including viscosity, melting temperature, surface tension, density, and viscous activation energy (Eη) were systematically investigated in the CaO–MgO–SiO2–Al2O3-50 % TiO2 slag system with SiO2/Al2O3 = 1.0. The effect of CaO/MgO on the structure and phase composition of the slag was studied using Raman spectroscopy and X-ray diffraction (XRD). The results of viscosity properties indicate that as the CaO/MgO ratio in the slag increase, viscosity and the viscous activation tend to decrease. Melting temperature and surface tension decreases with increasing CaO/MgO, while density increases. As the CaO/MgO ratio in the slag increases, polymerization decreases, leading to the dissociated basic oxides into metal cations and oxygen anions. This addition of basic oxides provides more O2−, increasing the O/Si ratio, disintegrating complex silica-oxygen composite ions into simple silica-oxygen composite anion, and reducing viscosity. Anosovite (MgTi2O5), CaAl2Si2O8, Mg (Al, Ti)2O4, spinel (MgAl2O4), augite (Ca (Mg, Fe, Al) (Al, Si)2O6) and Ca12Al14O33 were identified as the primary phases in slag. The appropriate CaO/MgO should not exceed 0.76. These findings will serve as a valuable technical foundation to support the development of the direct reduction smelting process for the comprehensive utilization of vanadium titanomagnetite.

Effect of surfactant modified phosphogypsum whisker on service performance of asphalt based on multi-scale experiments

The development of modern chemical technology had inevitably produced massive phosphogypsum (PSP), the accumulation and storage of PSP had caused serious economic losses and environmental pollution. As the secondary refining product of PSP, the application of phosphogypsum whisker (PSW) to asphalt pavement not only effectively mitigated the adverse impact of PSP on the economy and environment, but also promoted the resourceful utilization of solid waste. However, since PSW was an inorganic material, it was difficult to fuse well with asphalt. Therefore, to enhance the compatibility of PSW with asphalt, this study investigated the modification process of PSW by using four surfactants to modify PSW with organic coating. The effect of surfactants on the surface activity of PSW was evaluated by relevant tests, and the surface enhancement modification mechanism and microstructure of surfactants on PSW were investigated, and then the effect of surfactant-modified PSW (MPSW) on the service performance of asphalt was evaluated. The results showed that the surfactant covered the surface of PSW by intermolecular forces and chemical bonding, which enhanced the surface activity of PSW. The compatibility of PSW with asphalt was enhanced by surfactant, and the MPSW 10599was just physically blended with virgin asphalt. Although the brittleness of virgin asphalt was enhanced to a certain degree by MPSW, the thermophysical properties of virgin asphalt at low temperature was significantly improved, and the incorporation of MPSW enhanced the thermal stability and flame retardancy of virgin asphalt. The incorporation of MPSW would slightly increase the viscosity of virgin asphalt, but the viscous activation energy was reduced and the temperature sensitivity was improved. Furthermore, the low temperature performance of virgin asphalt was improved to a certain degree with the incorporation of MPSW, while the improvement effect was not significant once the temperature was close to the glass transition temperature. Finally, combined with the relevant test results, the recommended dosage of MPSW in asphalt was 10% in this study, and the surface modification of PSW by surfactant was a multifunctional method of powder modification.

Effect of B2O3/SiO2 molar ratio and B2O3 content on viscosity and structure of B2O3–SiO2–Al2O3–Na2O–TiO2 glass lubricant

AbstractGlass lubricant with a suitable viscosity is essential for producing high‐quality titanium products by the hot extrusion process. In this study, a novel lubricant of B2O3–SiO2–Al2O3–Na2O–TiO2 (BSANT) glass was proposed, where the effects of B2O3/SiO2 molar ratio (B/Si) and B2O3 content on viscosity and structure were investigated. The results showed that the BSANT glass viscosity was gradually decreased, and the viscous activation energy was decreased by 20.24% with an increased B/Si ratio from 0.415 to 0.719. This was attributed to the decreased amounts of Q3, [BO4], [AlO4], and bridging oxygen (BO) in the network structure, which in turn resulted in a decreased network degree of polymerization. When B2O3 content was increased from 18.70 to 33.12 mol.%, the melt viscosity value at 950 ℃ was decreased by 64.51%, and the viscous activation energy was reduced by 15.82%. Boron anomalies were also observed in glass melts with the B2O3 content from 28.28 to 33.12 mol.%. The mechanisms responsible for this phenomenon were thoroughly discussed in the study. Additionally, a comparison and discussion of the applications of glass lubricants in metal hot working were presented. A glass lubricant with a specific composition was recommended for use in hot extrusion process within the temperature range of 950–1100°C due to its relatively stable viscosity properties.

Comparative study on the rheological properties of cellulose acetate and double‐base propellant

AbstractCellulose acetate (CA) and nitrocellulose (NC) are both cellulose derivatives with similar chemical structure and physical properties, and CA are non‐flammable and biodegradable, so CA has been used as a safe substitute to NC for artillery propellant research. The ester functional groups of CA and NC are different, and there are other components in the propellant, so the rheological properties of CA and propellant can be different slightly. However, the comparative study of rheological properties between CA and propellant is rarely reported. In this paper, the rheological properties of CA and double‐base propellant (DP) in extrusion process was studied by in‐line slit rheometer. The results show that the power‐law model can describe the rheological properties of CA and DP well. The shear viscosity of CA and DP decreases gradually with the increase of solvent ratio, and when the solvent ratio of CA is 0.87 and that of DP is 0.34, the rheological properties of CA and DP are most similar. The Arrhenius equation can reflect the relationship between shear viscosity and temperature of CA and DP, and the viscous activation energy of CA is about 23.68 kJ/mol, while that of DP is about 7.38 kJ/mol. In general, the effect of temperature on the rheological properties of CA is stronger than that of DP.

High temperature phenylethynyl-terminated imide oligomers derived from asymmetric diphenyl ether diamines for resin transfer molding

Resin transfer molding (RTM) require phenylethynyl-terminated imide oligomers (PETIs) to exhibit low melt temperatures and better melt stability. To decrease the melt temperatures of PETIs and improve their resin transfer moldable processability, asymmetric 4,4′-diaminodiphenyl ether substituted by fluorine (F-ODA), trifluoromethyl group (3F-ODA) or phenyl group (p-ODA) were introduced. Asymmetric molecular structure and substituent groups decrease the melt temperatures of PETIs, endowing PETIs with the wider processing temperature windows and low minimum melt viscosity (<1 Pa s). These polyimides show pot lives of 30–60 min at 260–280 °C. Furthermore, the effects of backbone structure on melt fluidity of imide oligomers were discussed by the calculation of viscous activation energy (Ea,η) and analysis of Molecular Dynamics. PETI-3F and PETI-P based on 3F-ODA and p-ODA exhibit low and stable melt viscosities (<1 Pa s) at 250–270 °C and 260–270 °C for 4 h respectively, enabling the successful fabrication of carbon fiber reinforced polyimide composites via RTM process. After cured at 380 °C, the thermosets of PETI-3 and PETI-4 show high Tg of 412 °C and 402 °C and good thermal stability (Td5>550 °C). Cured PETI-3 and PETI-4 also show good mechanical properties (tensile strength >50 MPa). In comparison with p-ODA, 3F-ODA could provide PETIs with superior resin transfer moldable processability and higher heat-resistance and is more suitable to synthesize PETIs for RTM application, because of better balance between polymer segmental mobility and polymer chain packing.

The Synergistic Effect of Polyphosphates Acid and Different Compounds of Waste Cooking Oil on Conventional and Rheological Properties of Modified Bitumen

In order to conserve non-renewable natural resources, waste cooking oil (WCO) in bitumen can help lower CO2 emissions and advance the environmental economy. In this study, three different components of WCO were isolated and then, together with polyphosphoric acid (PPA), used separately as bitumen modifiers to determine the suitability of various substances in WCO with PPA. Conventional tests, including penetration, softening point temperature, and ductility, and the dynamic shear rheology (DSR) test, including temperature sweep and frequency sweep, were used to evaluate the influence of WCO/PPA on the traditional performance and rheological properties at high and low temperatures. The results indicate that WCO reduced the ductility and penetration value, when the use of PPA increased the softening point temperature and high-temperature performance. Compared to reference bitumen, the rutting factor and viscous activation energy (Ea) of bitumen modified with 4% WCO and 2% PPA has the most significant increase by 18.6% and 31.5, respectively. All components of WCO have a significant impact on improving the low-temperature performance of PPA-modified bitumen. The performance of the composite-modified bitumen at low temperatures is negatively affected by some waxy compounds in WCO, such as methyl palmitate, which tends to undergo a solid-liquid phase change as the temperature decreases. In conclusion, the inclusion of WCO/PPA in bitumen offers a fresh approach to developing sustainable pavement materials.

Effect of CaF2 and Li2O on structure and viscosity of low-fluoride slag for electroslag remelting of rotor steel

The structure and viscosity of CaF2-CaO-Al2O3-B2O3-SiO2-Li2O slag with varying CaF2 and Li2O contents were investigated by Raman spectroscopy, 27Al, 29Si and 11B magic angle spinning nuclear magnetic resonance (MAS-NMR) spectroscopy, and rotating cylinder method, respectively. The relative fraction ofQAl2 significantly increases, the fractions ofQAl3 andQAl4 decrease with increasing the CaF2 or Li2O content. Aluminum exists in the form of four-coordinated aluminum (AlⅣ) corresponding to AlO4 and a small amount of AlO3F. The fraction ofQSi0 species increases at the expense ofQSi1,QSi2(1Al) andQSi2 with increasing the CaF2 or Li2O content. B is present in the form of BⅢ, besides 0.57% of BIV in the glass with 14.69mass% CaF2. The relative fraction of T0 increases and T1 decreases as the CaF2 or Li2O content is increased. The degree of polymerization of aluminosilicate and borates decreases with increasing the CaF2 or Li2O content, which is consistent with the results of viscosity and viscous activation energy.

The effect of liquid crystalline graphene oxide compared with non-liquid crystalline graphene oxide on the rheological properties of polyacrylonitrile solution

Abstract In this article, polyacrylonitrile (PAN) and two kinds of graphene oxide (GO) with different structural properties are blended in dimethyl sulfoxide (DMSO) according to a certain ratio to prepare stable-spinning solution. One kind of GO is purchased, and we call it GO1. The other is a kind of self-made GO with liquid crystal property in solution, which is called GO2. The effects of two kinds of GO on the rheological properties of PAN/GO spinning solution (15 wt%) were studied. The results show that the viscous activation energy of the liquid crystal GO2/PAN blend solution is significantly higher than that of the nonliquid crystal GO1/PAN blend solution. Moreover, the liquid crystal system is more obviously affected by temperature. The structural viscosity index of the liquid crystalline GO2/PAN solution is obviously lower than that of the GO1/PAN solution. It indicates that the existence of liquid crystallinity is beneficial to the spinning of the solution. In the low-frequency region, the addition of GO1 makes the solution more elastic, and the addition of GO2 makes the solution more viscous.

Supercritical fluid extrusion: Die design and physicochemical properties of milk protein extrudates

Extrusion processing has been used to modify the functional properties of proteins. The protein-protein interactions, surface hydrophobicity, and rheological properties of milk protein concentrate extruded using dies of different geometries (circular, annular and slit) were quantified. With the same extrusion treatment history prior to the die, extrudates generated using dies with higher wall shear (slit 1.4 × 104 s−1 > annular 1.1 × 104 s−1 > circular 2.9 × 103 s−1) showed greater protein extractability, higher index of surface hydrophobicity, and enhanced water solubility index indicating significant breakdown of protein aggregates. Higher viscoelastic moduli (G' and G") and apparent viscosity were observed for slit die extrudate dispersions. However, low flow behavior indices (0.04–0.23(−)) and a high viscous activation energy (43 kJ/mol) of slit die extrudate dispersions implied their shear and temperature sensitivity, respectively. Thus, extrudate functionality can be optimized by selection of the appropriate die design.

Calculation and Analysis of the Structure and Viscosity of B2O3-Regulated CaO-Al2O3-Based Mold Fluxes

The high content of aluminum in the steel reacts with the CaO-Si2O-based mold fluxes, resulting in deterioration of the mold slag physical and chemical properties, which cannot be applied to the continuous casting molten slag casting process of high-Mn high-Al steel Herein, the thermodynamic and structural properties of low-reactivity CaO-Al2O3-based mold fluxes were investigated. The thermodynamic properties were studied based on the first principles of quantum mechanics. The results show that the formation of stable structures of B-O and O-B-O in the mold fluxes was beneficial to reduce the probability of structural interconnection, degree of polymerization, and viscosity of the molten slag. The increase in the ratio of CaO/Al2O3 = 0.88–2 led to an increase in the O2− concentration. O2− entered the [AlO4] structure to form a stable structure of [AlO6] and [AlO5], wherein [AlO6] was more stable than [AlO5], reducing the degree of polymerization of the network structure. When cosolvent content B2O3 = 2%–10%, a simple layered structure of [BO3] was formed, and the particle migration resistance, break temperature, and viscous activation energy of the mold fluxes were reduced, while the corrected optical basicity of mold fluxes was gradually increased.

Enhanced oil recovery performance of gemini surfactant-stabilized nanoemulsions functionalized with partially hydrolyzed polymer/silica nanoparticles

Nanoemulsion flooding is a novel route to enhanced recovery of petroleum resources over conventional water-flood by effective detachment and mobilization of residual oil trapped within rock-pores. In this article, we conducted experimental investigations to test the functionality of robust nanoemulsions comprising of gemini surfactant/polymer/silica nanoparticle assemblies; and explained mechanistic behavior of nanoemulsion-assisted oil displacement on a molecular scale. The presence of nano-sized oil droplets was confirmed by light scattering and CryoTEM imaging. Pseudoplastic behavior of nanoemulsions was identified, and viscous activation energies were determined using Arrhenius modeling. Viscoelasticity studies confirmed that elastic modulus dominated over viscous modulus, indicating that deforming forces do not exceed inter-droplet repulsions and interfacial stresses. Hence, nanoemulsion (oil) droplets retain their structural integrity under varying shear conditions. Core-flooding experiments showed that enhanced oil recoveries (EOR) of nanoemulsions improved over conventional aqueous fluids to 21–27% range of original oil in place (OOIP).

Non-Arrhenius behavior and fragile-to-strong transition of glass-forming liquids.

Characterization of the non-Arrhenius behavior of glass-forming liquids is a broad avenue for research toward the understanding of the formation mechanisms of noncrystalline materials. In this context, this paper explores the main properties of the viscosity of glass-forming systems, considering super-Arrhenius diffusive processes. We establish the viscous activation energy as a function of the temperature, measure the degree of fragility of the system, and characterize the fragile-to-strong transition through the standard Angell's plot. Our results show that the non-Arrhenius behavior observed in fragile liquids can be understood through the non-Markovian dynamics that characterize the diffusive processes of these systems. Moreover, the fragile-to-strong transition corresponds to a change in the spatiotemporal range of correlations during the glass transition process.

Relationship between thermophysical properties and structure of CMAS glass melts based on chromium slag

In an attempt to determine the relationship among the network structure, viscosity, electrical conductivity, surface tension, and density of chromium-containing glass melts, the variation in glass melt thermophysical properties of the CaO–MgO–Al2O3–SiO2 quaternary system were investigated by comprehensive physical property analysis and Raman spectroscopy. The results demonstrated that the network structural units Qn (n = 0, 1, 2, 3) coexisted in the glass melts and their mutual transformation caused changes in the depolymerization degree, leading to a range of viscous activation energies, conductive activation energies, surface tension, and melt densities. Additionally, the logarithm of viscosity varied linearly with the logarithm of electrical conductivity (slope: 0.67–1.54). Meanwhile, the surface tension and melt density decreased with temperature. Consideration of these interrelations is indispensable during the development of chromium-containing slag glass ceramics, particularly for pilot and industrial applications.

Analysis of viscous flow properties of styrene–butadiene–styrene-modified asphalt

Three styrene–butadiene–styrene (SBS, a block copolymer) modified asphalt samples with 5% SBS by weight were prepared using three types of common base asphalt to analyze the viscosity and viscous flow properties of SBS-modified asphalts. Rotational viscosity tests were conducted under various temperature and shear rate conditions, and the effects of the test conditions on the viscosity of the base and modified asphalt samples were analyzed. The viscous activation energy (Eη) and non-Newtonian index (n) were calculated using the Arrhenius equation and the power law equation, respectively. The temperature sensitivity and fluid properties were considered relative to Eη and n, respectively, based on which master curves were established to predict viscosity. The results indicate that various types of base asphalt show inconsistent temperature sensitivity and fluid properties after SBS modification. SBS can improve the temperature stability of B# asphalt; however, it has adverse effects on the A# and C# asphalts. Compared with the base asphalt, the n values of the SBS-modified asphalts are all lower than 1, indicating that the asphalt is converted from a Newtonian to non-Newtonian fluid and the non-Newtonian properties of various types of asphalt vary with temperature. Master curves can describe the responses of the SBS-modified asphalt viscosity to test the conditions that adequately predict the viscosity.

Investigations on viscosity and flow behavior of polyphosphoric acid (PPA) modified asphalt at high temperatures

The rheological behavior of asphalt binders is composed of the deformation behavior at medium-low temperature and the flow behavior at high temperature, however, few researchers pay attention to the latter for polyphosphoric acid (PPA) modified asphalt. To analyze viscosity characteristics and flow behavior of PPA modified asphalt, six kinds of PPA modified asphalts with different mass fractions were prepared, and the effects of PPA dosage, test temperature and shear rate on the Brookfield rotary viscosity were discussed. The rheological parameters, viscous activation energy Eη, flow index n and consistency coefficient k were obtained based on Arrhenius law and the power law model, and the flow master curve was established by the time-temperature superposition principle. The results show that viscosity is positively correlated with PPA dosage, approximately, conforms to the exponential growth model. Meanwhile, viscosity is negatively correlated with test temperature and shear rate, respectively, in accordance with Arrhenius equation and power law equation. Under the test conditions, the flow index n of six kinds of asphalts goes up with the increase of PPA dosage or the decrease of temperature. However, all the n values are less than 1, indicating asphalts are pseudo-plastic fluid. The consistency coefficient k is consistent with the viscosity with the change of PPA dosage and test temperature, and may represent viscosity to a certain extent. The flow master curve with three parameters established can describe the effects of test temperature and shear rate on viscous flow characteristics. In this investigation, the non-Newtonian flow behavior of PPA modified asphalt was analyzed from the perspective of viscosity, proposing a method to estimate the dependence of viscosity on test conditions in a wider range through limited experimental data. This method is not only applicable to PPA modified asphalt, but also can provide references for the study of viscous flow characteristics of other asphalt binders.

Effect of Substituting CaO with BaO and CaO/Al2O3 Ratio on the Viscosity of CaO–BaO–Al2O3–CaF2–Li2O Mold Flux System

The effect of substituting CaO with BaO and CaO/Al2O3 ratio on the viscosity of CaO–BaO–Al2O3–CaF2–Li2O mold flux system was studied by rotational viscosity method. The results showed that the viscosity increased with increasing BaO as a substitute for CaO, while the viscosity decreased with the increase in CaO/Al2O3 ratio. The viscous activation energy of the slags is from 92.1 kJ·mol−1 to 133.4 kJ·mol−1. Either the Arhenius or the Weymann–Frenkel equation can be applied to establish the viscosity prediction model. In this paper, the Weymann–Frenkel equation and a new optical basicity with regard to Al2O3 as an acidic oxide were applied to the modified NPL model for predicting the viscosity of CaO–BaO–Al2O3–CaF2–Li2O mold flux system. The estimated viscosity is in good agreement with the measured viscosity.

Effect of CaF2 on viscosity, structure and properties of CaO-Al2O3-MgO-SiO2 slag glass ceramics

Bayan Obo tailings (BOTs), fly ash (FAS), and stainless-steel slag (SSS) are industrial wastes that require reasonable, clean, and effective utilization for environment protection. The paper focuses on the structure and properties of glass-ceramics that were prepared by melting BOT, FAS, and SSS raw materials. The effect of CaF2 on the viscosity, structure, and performance of CaO-Al2O3-MgO-SiO2 (CAMS) slag glass-ceramics is determined by viscometer, differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, and physicochemical properties measurements. The results show that moderate amounts of CaF2 facilitates depolymerization of the silicate networks, which leads to a decrease in the melting temperature, viscosity and viscous activation energy of glass. However, the content of more than 3% CaF2 results in a dramatic decreases in the chemical stability of the glass-ceramics because of the transformations of the main crystalline phase from diopside to anorthite, which is accompanied by fluorite precipitation.

Anomalous variations in the viscous activation energy of suspensions induced by fractal structuring

HypothesisIn suspensions, the activation energy of viscous flow is an important property that controls the temperature dependence of the viscosity. However, the differentiated roles of the properties of the liquid phase and the structure of the solid particles in controlling the activation energy remain unclear. We propose here that particle fractal structuring yields an anomalous behavior in the activation energy of viscous flow. ExperimentsThe rheology of two series of suspensions consisting of glass beads suspended in poly(1-decene) was investigated over a wide range of solid volume fractions (0.00 ≤ φ ≤ 0.55). These suspensions were characterized by their viscosity (η, Pa∙s) via shear rate sweeps and by their yield stress (Pa) via oscillatory amplitude sweeps. FindingsInterestingly, for suspensions consisting of nominally smaller particles (d50 ≈ 5 µm), we observe an anomalous decrease in the activation energy (Ea, kJ/mol) of viscous flow with increasing solid fraction. Based on oscillatory rheology analyses, it is suggested that such anomalous behavior arises due to entropic effects that result from the formation of fractally-architected cooperatively rearranging regions (i.e., agglomerates) in the suspension.

The Potential for Metamorphic Thermal Pulses to Develop During Compaction‐Driven Fluid Flow

AbstractCompaction‐driven fluid flow below the brittle‐ductile transition may be a means of transporting fluids during metamorphism. In particular, when a decompaction weakening mechanism is introduced to account for the rock viscosity reduction due to fluid overpressures, channeling instabilities evolve into high‐porosity/permeability fluid conduits that focus mass and energy transfer. In this study, we consider a crustal rheology that accounts simultaneously for upward‐increasing viscosity and decompaction weakening to examine the nucleation and evolution of fluid channelization in two dimensions (2‐D). The model shows that plume‐shaped flow patterns can develop on time scales as short as 104 years, during which the plume tails act as fluid conduits and the plume heads act as fluid dispersion zones near the brittle‐ductile transition. Collection of fluids into conduits is accomplished by a basal fluid catchment zone characterized by strong lateral fluid pressure gradients but low porosity/permeability. Relatively narrow ranges of viscous activation energy (∼100 kJ mol−1) and decompaction weakening factor (∼10−4) are constrained if the fluid conduits are of kilometer scale in width. Significant thermal excursions (∼65 °C) can be induced if a high flow rate, potentially from rapid intermittent dehydration, is realized within channels. Moreover, if the focused fluids emanate from external anomalously hot sources (e.g., magma intrusion), thermal pulses (&gt;100°C), and steep lateral temperature gradients (&gt;50°C km−1) can be generated. Given the focusing efficiency estimated from our 2‐D compaction model, simple 3‐D modeling further shows that tubular conduits have the potential to cause thermal pulses &gt;200°C within 104 years.