Analysis Of Thermal Properties Research Articles

Comparative analysis of sound and thermal insulation properties of porous and non-porous polystyrene submicron fiber membranes

Interior and surface porous materials have widespread use in a wide variety of applications, especially for thermal and sound insulation due to their porous structure. Both sound and thermal insulation have great importance in a wide range of technical textile application areas including clothing and transportation such as train, car, aerospace and so on. In this study, for the first time, porous and non-porous polystyrene submicron fibers membranes have been compared for both sound absorption insulation and thermal insulation properties at the same time. Porous polystyrene electrospun fibers were produced at two different ratios of DMF:THF (4:1 and 7:3 ratio of DMF:THF) under conrolled humidity environment (60% RH). The results show that higher sound absorption insulation (SAC values) were obtained for non-porous fiber membrane (PS-ref) produced under ambient condition (30% RH) than porous fiber membrane (PS/7:3/RH and PS/4:1/RH) produced under controlled humidity condition (60% RH) by use of DMF:THF in 7:3 ratio and 4:1 ratio. Similar tendency was observed for thermal conductivity coefficient. Thus, all these results show that thinner fiber leading higher surface area has more dominant effect on both thermal insulation and sound absorption insulation than the formation of porous structures on the surface or internal structure of the fiber.

Nanostructured VO2 (A) and VO2 (M) Derived from VO2 (B): Facile Preparations and Analyses of Structural, Thermal, Optical and Thermophysical Properties

Vanadium dioxide (VO2) is an interesting compound that exists in different polymorphic phases with varying characteristics and potential applications. In this study, fabrication and property analyses of three VO2 polymorphs, namely VO2 (B), VO2 (A), and VO2 (M), are described. Specifically, VO2 (B) was prepared via hydrothermal method under a low synthesis temperature of 180 °C and a fast processing time of 24 h. In addition, VO2 (A) and VO2 (M) were derived from the as-synthesized VO2 (B) using sequential hydrothermal treatment and calcination process, respectively. From the field-emission scanning electron microscope (FESEM) scans, belt-like VO2 (B) nanoparticles with dimensions of as low as 35 × 130 nm2 were formed. Further, hydrothermal treatment of the as-synthesized VO2 (B) resulted to a flower-shaped VO2 (A) due possibly to an oriented attachment mechanism. Meanwhile, annealing of the VO2 (B) sample caused granular growth that produced plate-like and oblate shaped VO2 (M) with dimensions of 135 to 306 nm in diameter and 28 to 37 nm in thickness. Moreover, the thermochromic properties of the samples were examined using differential scanning calorimetry (DSC) while the thermophysical properties of the samples were measured via microflash method. Accordingly, the prepared VO2 (A) and VO2 (M) samples exhibited phase transition behavior at 168.37 °C and 68.6 °C, respectively. Subsequently, changes in the thermophysical properties of each sample can be observed across the measured transition temperature. In particular, an increase in both the thermal diffusivity and thermal conductivity of VO2 (M) can be observed when the temperature was raised from 50 °C to 100 °C. On the other hand, there is a noticeable decrease in the thermal conductivity of VO2 (A) when the temperature was increased from 150 °C to 200 °C.

Li2CO3 as Protection for a High-Temperature Thermoelectric Generator: Thermal Stability and Corrosion Analysis

In most steelmaking processes, huge amounts of waste heat at high temperature (700–800 °C) are thrown into the environment without any use. An alternative use for this waste heat is electricity generation through thermoelectric generators. However, these high temperatures, as well as their fluctuations over time, affect not only the conversion rate of the thermoelectric generator but also its useful lifetime. The incorporation of a latent thermal energy storage (TES) system could be a solution; nevertheless, the thermal stability and corrosive effect of the (PCM) phase change material are key aspects for the thermal storage system definition, in terms of durability. In this work, developed in the framework of the European project “PowGETEG” (RFSR-CT-2015-00028, funded by the Research Fund for Coal and Steel), a high-temperature analysis (700–800 °C) of the Li2CO3 thermal properties, thermal stability and corrosive effect on the AISI 304 and AISI 310 stainless steels is carried out. The results show that the eutectic salt Li2CO3 exhibits high thermal stability with neither change in its thermal properties nor material degradation. This work shows that lithium carbonate Li2CO3 and AISI 310 make a very good combination for the definition of a thermal storage system able to protect a high-temperature thermoelectric converter from temperature variations, making it more reliable.

Stability and Thermal Conductivity of Tri-hybrid Nanofluids for High Concentration in Water-ethylene Glycol (60:40)

Background: Research has been focused on improving the thermal properties of single nanofluid components for recent years. Therefore, hybrid nanofluids or composites have been developed to improve heat transfer performance. Stability and thermal conductivity of Al2O3-TiO2- SiO2 nanoparticles are suspended in the fluid base of water (W) and ethylene glycol (EG) mixture with volume ratio of 60:40. Methods: Experiments were tri-hybrid nanofluid stability was investigated for volume concentration of 0.5 ~ 3.0%, and temperature conditions from 30 to 70°C for thermal conductivity measurements using a KD2 Pro Thermal Properties Analyzer. The experimental results show that the tri-hybrid nanofluid stability analysis was performed using a stable UV-Vis method for up to 30 days after preparation with 10 hour sonication time. Results: Comparison of data concentration ratios with sedimentation for single, hybrid, and trihybrid nanofluids yielding a stable tri-hybrid nanofluid with 80-90% value. Evaluation of zeta potential for tri-hybrid nanofluids yielded 63.72 mV in excellent stability classification. Sedimentation of this visual observation is influenced by the gravity of the movement of particles in the tube after 30 days. Conclusion: The highest thermal conductivity for tri-hybrid nanofluids was obtained at 3.0% and a maximum increase of up to 27% higher than that of the basic fluid (EG/W). Tri-hybrid nanofluids with a concentration of 0.5% gave the lowest effective thermal conductivity of 13.4% at 70°C.

Influence of buriti pulp (Mauritia Flexuosa L.) concentration on thermophysical properties and antioxidant capacity

This study aimed to determine the thermophysical properties and antioxidant capacity of buriti pulp with concentrations of 7, 9, 11, 13, and 15 °Brix. Total solids and moisture content were determined in an oven, and the specific mass was determined by the pycnometer method, while the specific heat, thermal diffusivity, and thermal conductivity were obtained using the KD2 Pro thermal properties analyzer. The antioxidant capacity was determined by the 2,2′-azino-bis-3-ethylbenzthiazoline-6-sulfonic acid (ABTS) and 2,2-diphenyl-1-picrylhydrazyl (DPPH) methods. At high concentrations, total solids and specific mass increased while moisture content decreased, and the soluble solids concentration did not influence specific heat, thermal diffusivity, and thermal conductivity. The antioxidant capacity of buriti pulps ranged from 0.07 to 10.45 μmol Trolox/g sample for the ABTS method and from 293.77 to 411.46 μmol Trolox/g sample for the DPPH method.

Correlation analysis of microstructure, protein pattern, and thermal properties of Procambarusclarkia subjected to different cryogenic treatments.

The objective of this work was to investigate the freezing and storage temperature (−80 and −18℃) on the microstructure, protein pattern, and thermal properties of red swamp crayfish after one‐week storage, and a Pearson correlation analysis was performed among these attributes. After cryogenic treatments for short‐term storage, Tp (pretein denaturation temperature) was significantly raised (p < .05) except for samples frozen at −80℃ prior to store at −18℃ (−80/‐18). Samples frozen and stored at −80℃ (−80/‐80) had lower number and sum area of white regions in histology, higher intensity of most protein bands in sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS‐PAGE) image, and relatively higher Tp and ΔH (p < .05), while −80/‐18 samples had lower intensity of most protein bands and TP 2, and higher number and sum area of white regions and ΔH 2 (p < .05). Pearson's analysis results showed the intensive TN T and MLC 1 band could be potentially considered as the markers of tissue integrity and protein degradation. Therefore, the three attributes could be applied to comprehensively assess the quality of frozen aquatic products, and −80/‐80 treatment was appropriate for crayfish preservation.

Comparative Analysis of Thermal and Physico-Mechanical Properties of Polyethylene Compositions Containing Microcrystalline and Nanofibrillary Cellulose

Comparative Analysis of Thermal and Physico-Mechanical Properties of Polyethylene Compositions Containing Microcrystalline and Nanofibrillary Cellulose

Effect of Fiber Composition on the Physical, Mechanical, and Thermal Behavior of Jute and Human Hair–Reinforced Epoxy Composites

Abstract Polymer composites reinforced with jute fiber have been widely used in window and door frames, biogas cylinders, furniture, suitcases, helmets, automobile and railway coach interiors, boats, etc. Human hair is a versatile material that has been identified as having significant potential for use as a reinforcement in composites because of its excellent material properties. This article deals with the reinforcement of jute and human hair in epoxy matrix–based composites. Composites fabricated with constant volume fractions but with five different fiber ratios of jute and human hair were studied. Analysis of physical, mechanical, and thermal properties was made on the fabricated Natural Fiber Reinforced Polymer Composites (NFRPCs). The results showed an increase in the mechanical properties with an increase in human hair content in the composite. The tensile, flexural, and double shear strength of the composite with 25 % human hair obtained was 23.45, 80.83, and 44.25 MPa, respectively, whereas 25 % jute fiber–reinforced composite shows 13.69, 61.63, and 28.25 MPa, respectively. The properties of jute fiber composites were increased when adding the human hair with jute fiber in the ratio of 18.75:6.25, 12.5:12.5, and 6.25:18.75 percentage of jute fiber and human hair, respectively. From moisture analysis of the composites, it was observed that increasing the human hair content with matrix caused a decrease in the absorptivity of the composite. From thermogravimetric analysis (TGA), composite with 25 % jute fiber showed the final degradation temperature at 480.12°C, whereas for 25 % human hair, composite obtained at 450.12°C. TGA showed a proportionate increase in thermal stability with increase in jute fiber content of the composites.

Determination of group velocity based on nanoindentation using Si and SiO2/Si wafers

The analyses of thermal transport properties can help improve the performance of high-tech semiconducting devices, such as thermoelectric generators and electronic devices. However, methods to measure thermal transport properties are limited, especially the group velocity and phonon mean free path (MFP) of thin films. Herein, we propose a simple technique to measure the group velocity and phonon MFP based on nanoindentation using Si and SiO2/Si wafers. The group velocities, including the longitudinal, transverse, and average group velocities, were estimated using Young’s modulus, shear modulus, and Poisson’s ratio. The phonon MFP was estimated from the average group velocity, lattice thermal conductivity, and specific heat. The determined group velocities (∼6050 m/s) and phonon MFP (∼80 nm) when the Si wafer was used as a bulk material were in good agreement with the corresponding reference data. The influence of the underlying Si substrate increased when the indentation depth was increased when the SiO2/Si wafer was used as a thin film (SiO2 layer thickness, 200 nm). The influence of the underlying Si substrate existed even when the smallest indentation depth of 50 nm and the determined group velocities (∼4750 m/s) and phonon MFP (∼0.5 nm) were slightly different from those of the reference data. Therefore, although the accuracy of the measurement technique can be improved, this study verified that nanoindentation can be used to measure the group velocity and phonon MFP of materials. Furthermore, this technique opens a pathway for investigating the thermal transport properties of nanostructured materials.

Thermal property analysis of tri layer composite fabric towards the utility of sleeping bag

PurposeThis paper aims to investigate on composite fabrics to develop the improved sleeping bag using trilayered textile structures. A thermal comfort analysis of fabrics is essential to design an enhanced type of sleeping bag.Design/methodology/approachIn this study, optimizing thermal and permeability properties of different combinations of trilayer composite fabrics was done. The inner layer was 100% wool-knitted single jersey fabric. The middle layer was polyester needle punched non-woven fabric. The outermost layer was nylon-based Core-Tex branded waterproof breathable fabric. Five variations in wool-knitted samples were developed by changing the loop length and yarn count to optimize the best possible combination. Two different polyester non-woven fabrics have been produced with the changes in bulk density. Twelve trilayer composite fabric samples have been produced, and thermal comfort properties such as thermal conductivity, thermal absorptivity, thermal resistance, air permeability and relative water vapour permeability have been analysed.FindingsAmong the 12 samples, one optimized sample has been found with the specification of 100% wool with 25 Tex yarn linear density having 4.432-mm loop length inner-layered fabric, 96 g/m2 polyester nonwoven fabric as the middle layer, and 220 g/m2 Nylon-Core tex branded outermost layer. All the functional properties of the composite fabric are significantly different with the knitted wool fabrics and polyester nonwoven fabrics, which have been confirmed by analysis of variance study.Originality/valueThis research work supports for producing sleeping bag with enhanced comfort level.

Influence of Calcium Silicate and Hydrophobic Agent Coatings on Thermal, Water Barrier, Mechanical and Biodegradation Properties of Cellulose.

Thin films of cellulose and cellulose–CaSiO3 composites were prepared using 1-ethyl-3-methylimidazolium acetate (EMIMAc) as the dissolution medium and the composites were regenerated from an anti-solvent. The surface hydrophilicity of the resultant cellulose composites was lowered by coating them with three different hydrophobizing agents, specifically, trichloro(octadecyl)silane (TOS), ethyl 2-cyanoacrylate (E2CA) and octadecylphosphonic acid (ODPA), using a simple dip-coating technique. The prepared materials were subjected to flame retardancy, water barrier, thermal, mechanical and biodegradation properties analyses. The addition of CaSiO3 into the cellulose increased the degradation temperature and flame retardant properties of the cellulose. The water barrier property of cellulose–CaSiO3 composites under long term water exposure completely depends on the nature of the hydrophobic agents used for the surface modification process. All of the cellulose composites behaved mechanically as a pure elastic material with a glassy state from room temperature to 250 °C, and from 20% to 70% relative humidity (RH). The presence of the CaSiO3 filler had no effect on the elastic modulus, but it seemed to increase after the TOS surface treatment. Biodegradability of the cellulose was evaluated by enzyme treatments and the influence of CaSiO3 and hydrophobic agents was also derived.

Experimental investigation on the thermal characteristics and grey correlation analysis of frost penetration depths for different subgrade soils

In this study, thermal characteristics of the subgrade soils (well-graded sandy soil, low-plasticity clayey soil and low-plasticity silty soil) were tested by a KD2-Pro Thermal Properties Analyzer. Then, frost penetration depths have been predicted by modified Berggren equation for a subgrade section considering climatic conditions of Turkey's geographic regions. Experimental results showed that the thermal conductivity is maximum for the well-graded sandy soil and the minimum values were determined for the low-plasticity silty soil. The highest values of heat capacity, thermal diffusion and thermal resistance have been measured for the low-plasticity clayey soil and minimum values of the heat capacity, thermal diffusion and thermal resistance were observed on the well-graded sandy soil specimens. The maximum frost penetration depths were predicted for the well-graded sandy soil specimens and the minimum frost penetration depths were observed on the low-plasticity clay soils due to water holding capacity and high insulation of clay. In addition, the Gray correlation analysis was utilized to present the correlation degree between the frost penetration depths and different parameters including thermal characteristics, average annual temperatures, number of days covered snow, surface freezing index, and correction factors. Results showed that the thermal characteristic has more influence than other parameters on the frost penetration depths.

Thermal Probe Enhanced with Pulsed Plasma Discharges for Efficient Ice Penetration

Pulsed plasma discharges are investigated here as a means of reducing the power necessary for a thermal probe to penetrate an ice sheet. When a high-energy plasma discharge occurs in ice, the ensuing shockwave fractures the ice field and reduces its thermal conductivity. If this reduction is sufficient in both magnitude and geometric extension, it can decrease the heating power necessary to keep the thermal probe descending. This concept is investigated from a theoretical point of view by modeling in a finite element thermal analysis the effects of a cracked ice region on the thermal probe’s performance. Thermal conductivity reduction and cracked region extent are introduced as the parameters that predict power savings. An experimental setup was also created to allow 80 J discharges through an ice sample at a voltage of 40 kV. The system was used in combination with a commercial thermal properties analyzer to derive thermal conductivity reduction values to feed to the system. The cracked region was topologically divided into two regions with different cracking behavior, and the thermal conductivity of each region was measured.

Experimental Investigation of Thermo-Physical Properties of Tri-Hybrid Nanoparticles in Water-Ethylene Glycol Mixture

In recent years, research has focused on enhancing the thermo-physical properties of a single component nanofluid. Therefore, hybrid or composite nanofluids have been developed to improve heat transfer performance. The thermo-physical properties of the Al2O3-TiO2-SiO2 nanoparticles suspended in a base of water (W) and ethylene glycol (EG) at constant volume ratio of 60:40 and different volume concentrations were investigated. The experiment was conducted for the volume concentrations of 0.05, 0.1, 0.2, and 0.3% of Al2O3-TiO2-SiO2 nanofluids at different temperatures of 30, 40, 50, 60, and 70 °C. Thermal conductivity and dynamic viscosity measurements were carried out at temperatures ranging from 30 to 70 °C by using KD2 Pro Thermal Properties Analyzer and Brookfield LVDV III Ultra Rheometer, respectively. The highest thermal conductivity for tri-hybrid nanofluids was obtained at 0.3% volume concentration, and the maximum enhancement was increased up to 9% higher than the base fluid (EG/W). Tri-hybrid nanofluids with a volume concentration of 0.05% gave the lowest effective thermal conductivity of 4.8 % at 70 °C temperature. Meanwhile, the dynamic viscosity of the tri-hybrid nanofluids was influenced by volume concentration and temperature. Furthermore, tri-hybrid nanofluids behaved as a Newtonian fluid for volume concentrations from 0.05 to 3.0%. The properties enhancement ratio (PER) estimated that the tri-hybrid nanofluids will aid in heat transfer for all samples in the present. The new correlations for thermal conductivity and dynamic viscosity of tri-hybrid nanofluids were developed with minimum deviation. As a conclusion, the combination of the enhancement in thermal conductivity and dynamic viscosity for tri-hybrid at 0.3% volume concentration was found the optimum condition with more advantage for heat transfer than other concentrations.

Design and Analysis of a Rectangular Fin with Comparing by Varying Its Geometry and Material, With Perforation and Extension

Extending fins improve the rate of heat transfer or decrease convection. A fin is only for the reason of increasing the surface area in order to maximize heat transmission like a motor, heat exchanger, CPU, or to a heat-generating surface area. The benefit of performing thermal analysis on a flat fin is that it will tell how far heat is dissipated. This paper's primary purpose is to design and evaluate the thermal properties of rectanglular fin with varying geometry and content, and to expand the rectangular fin plate with Catia5R tools. Catia and Ansys are used to construct the geometries, and analyses of thermal properties are applied to them The tip is 5mm wide at present, decreased to 4mm. The aluminum alloy used in the manufacture of the rectangular fin body has thermal conductivity of 110-160 mK. The conducting coating on this paper is replaced with Aluminum Alloy 1100, which has a thermal conductivity of 210 to the mW/mk for the substrate and many unusual and prolonged margins. Case studies are used and graphed as well as total conclusions are drawn.

Statistical and computational analysis of an environment-friendly MWCNT/NiSO4 composite materials

Abstract A brake pad material has been developed with multiwall carbon nanotube (MWCNT) and Nickel sulfate (NiSO4) to increase the heat transfer rate and better manufacturability. The maximum hardness of brake pad sample is found at 15 Ton compacting load and 150 °C sintering temperature. The performance of developed brake pad is compared with conventional brake pads. Scanning Electron Microscope (SEM) with Energy Dispersive X-Ray (EDX), high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), gas sorption analyser (GSA) and thermal property analyser (TPA) are used to measure the distribution of elements, compound analysis, porosity distribution and thermal properties analysis respectively. The wear particles (mass loss) are less in the developed brake pad. The results show that developed brake pad material is superior compared to market available brake pads. An artificial neural network (ANN) model has been developed to predict the mass loss and coefficient of friction (CoF). The input parameters of 300 rpm, 50 N load and 125 °C temperature are the near optimal parameters combination for minimum wear and maximum CoF as observed by the design of experiment (DOE). The ANN and DOE results are verified with experimental findings. An ANSYS model has also been developed to study the temperature variation with time. The model has also compared with experimental results and found the 1% error.

Thermophysical Properties for ZnO-Water Nanofluid: Experimental Study

This paper presents the thermophysical properties of zinc oxide nanofluid that have been measured for experimental investigation. The main contribution of this study is to define the heat transfer characteristics of nanofluids. The measuring of these properties was carried out within a range of temperatures from 25 °C to 45 °C, volume fraction from 1 to 2 %, and the average nanoparticle diameter size is 25 nm, and the base fluid is water. The thermophysical properties, including viscosity and thermal conductivity, were measured by using Brookfield rotational Viscometer and Thermal Properties Analyzer, respectively. The result indicates that the thermophysical properties of zinc oxide nanofluid increasing with nanoparticle volume fraction increasing, as well as the thermophysical properties of zinc oxide nanofluid affected by the change in temperature.

Influence of SDBS Surfactant on Stability, Thermal Conductivity and Viscosity of h-BN/EG Based Nanofluids

In present work, an experimental study was carried out to investigate the influence of anionic surfactant (SDBS) on stability, thermal conductivity and viscosity of h-BN/EG based nanofluids. The nanofluids were prepared via two-step method and characterized by using zeta-sizer, thermal property analyser and viscometer. The volume concentration of h-BN (0.05%) remains constant whereas SDBS volume concentration sweep from 0.05% to 2%. Current results indicate, the zeta potential increases with surfactant addition, but overall, zeta potential shows inverse relation with SDBS concentration. As the value reduced from -57.5mV to -40.5mV when SDBS concentration increase from 0.05% to 2%. While the particle size increase (396nm to 817.9nm) linearly with SDBS concentration due adsorption of surfactant molecules. On the other hand, thermal conductivity over temperature range 25°C-50°C shows maximum enhancement ∼6.57% at 25°C for 1 vol% SDBS. However, dynamic viscosity increase abruptly after 0.5 vol% of SDBS. Therefore, 0.5 vol% could be treated as the optimum SDBS concentration with reduced viscosity (∼2.85%) and increased thermal conductivity (∼3.26%) as compared to base fluid at 25°C. Potential of such optimum combination of nanofluids (0.05vol% h-BN with 0.5 vol% SDBS) may be manipulated in circulating fluid thermal management systems.

Rock thermal properties from well-logging data accounting for thermal anisotropy

The limitations of the existing techniques for in situ rock thermal property measurements and numerous cases with non-coring drilling determine the necessity for methods of rock thermal property determination based on well-logging data. Existing approaches for determining rock thermal properties from well-logging data are appropriate only for isotropic rocks. Since many rock types, especially organic-rich shales, exhibit a considerable degree of heterogeneity and anisotropy, advanced approaches for well log-based determination of rock thermal properties are highly desired. The implementation of the new thermal core logging technique, which provides continuous and high-precision measurements of the principal components of the thermal conductivity tensor and volumetric heat capacity from core samples, enabled the development of a new framework for the indirect determination of rock thermal properties. An enhanced technique for determining rock thermal conductivity and volumetric heat capacity from well-logging data accounting for thermal anisotropy and in situ thermobaric conditions is proposed and tested. This technique includes both the application of theoretical models and regression analysis of rock thermal properties, depending on the availability and quality of the input data. Three theoretical models involving a correction factor were compared to provide the best results. The experimental data of rock thermal properties inferred from the thermal core-logging and well-logging data from five wells (1630 samples) drilled through two highly anisotropic unconventional formations – the Bazhenov and the Domanic – were used as the basis of this newly developed approach. It is shown that rock thermal conductivity can be predicted from well-logging data accounting for thermal anisotropy with an uncertainty of less than 12 % and rock volumetric heat capacity with a total uncertainty of less than 5%.

Extraction and characterization of indigenous Ethiopian castor oil bast fibre

Bast natural fibers have gained importance in the recent years mainly due to their ecofriendliness and their potential availability as raw materials for textile industries. In the present study extraction and characterization of fibers from the stem of Ethiopian indigenous castor oil plant is conducted for possible utilization in textile and related industrial applications. Among the different fiber extraction methods chemical retting using aqueous alkaline media (NaOH) is used for the extraction of the bast fiber. In this study the extraction was carried out by setting appropriate retting conditions of concentration of alkali, temperature and time. The extracted fibers for experimental analysis under the combined conditions were tested for chemical composition, gross morphology, mechanical and thermal properties. The analysis on chemical composition revealed that the castor oil bast [COB] fiber is composed of 64.5–67.3% cellulose, 16.4–21.5% hemicellulose, 15.8–17.2% lignin, 0.3–0.9% extractive with 4.9–5.3% ash content. FTIR spectra of the extracted fibers also confirmed the presence of cellulose, hemicellulose, lignin and extractives. Analysis on dimensional characteristics of the fiber showed that the extracted fiber has a diameter of 14.2–30.8 µm and fineness of 4.5–13.5 tex with fiber length ranging from 1.3 to 10 cm; the moisture content and moisture regain of the fiber are 7.0–9% and 8.1–10% respectively. Tests on mechanical properties of the extracted COB fiber show a tensile strength of 250–700 MPa with tenacity in the range of 57.80–86.89 cN/tex, elongation of 1.2–5% and elastic modulus of 2114.55–2625.44 cN/tex. TGA results for thermal property analysis indicated that the COB fiber has very good thermal stability with a thermal decomposition temperature in the range of 386.5–498.9 °C. The reasonably high cellulose content, good dimensional and moisture characteristics of COB fiber and its very good mechanical and thermal properties in comparison with conventional natural fibers such as jute, flax, hemp and cotton indicate the possibility for versatile conventional and non-conventional applications of COB fiber such as in textiles and in fiber reinforced composites.