Numerical investigation of the performance of a triple concentric pipe heat exchanger

Quadir, G.A.; Badruddin, Irfan Anjum; Salman, Ahmet Bedii

doi:10.1016/j.ijheatmasstransfer.2014.03.042

Cited by 57 publications

(14 citation statements)

References 10 publications

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“…En general, en el efecto sobre el coefieciente global de transferencia de calor y para el cálculo en el diseño de intercambiadores de calor, se incluye el valor de la resistencia ofrecida por la capa de ensuciamiento, [10] [38] [39], como se muestra en la siguiente ecuación: Donde:…”

Section: Modelos De Ensuciamientounclassified

Modelos de Ensuciamiento en Intercambiadores de Calor Tubulares en Sistemas indirectos en Procesos uHt en la Industria Láctea

Orozco

Urrego

2016

Publ. investig.

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resuMen La tecnología de ultra alta temperatura (UAT) se utiliza ampliamente en la industria de la leche para el tratamiento térmico, ofreciendo una alta eficiencia en cuanto a la destrucción de microorganismos esporulados. Sin embargo, dentro de este proceso se encontró que a temperaturas entre 75°C y 110°C, se llevan a cabo procesos de agregación y desnaturalización de proteínas y precipitación de sales minerales que forman una capa o costra de ensuciamiento en las paredes del tubo de calentamiento; el componente más importante en el fenómeno de ensuciamiento, es la proteína sérica llamada -Lactoglobulina. En este trabajo se resumen los diferentes modelos matemáticos que explican el fenómeno de ensuciamiento a partir de la transferencia de masa. La velocidad de ensuciamiento es el resultado de la diferencia entre la velocidad de acumulación de depósitos y la velocidad con que se remueven. Se encontró que los modelos de KernSeaton y Fryer-Slater son los más ampliamente usados, pues son modelos de velocidad de ensuciamiento en función de la energía de activación y la temperatura de película interfacial entre la capa de ensuciamiento y la leche. Otros modelos identificados nacen en la industria petroquímica, pero son adaptados en el estudio de la desnaturalización de la proteína de la leche, como los de Ebert-Panchal y Paterson-Fryer.Palabras clave: -Lactoglobulina, ensuciamiento, intercambiadores de calor de doble y triple tubo, modelos asintóticos, número de Biot, ultra alta temperatura (UAT). AbstrAct Ultra-High Temperature (UHT) Technology, is widely used in the dairy

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Section: Modelos De Ensuciamientounclassified

Modelos de Ensuciamiento en Intercambiadores de Calor Tubulares en Sistemas indirectos en Procesos uHt en la Industria Láctea

Orozco

Urrego

2016

Publ. investig.

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“…The TCTHE was fabricated by Quadir et al [5] and investigated the heat exchange characteristics of three fluids under different configurations. Quadir et al [6] investigated the triple tube concentric heat exchanger using FEM under steady condition and found out the thermal behavior and overall heat transfer coefficients over the entire length of the heat exchanger. Antony et al [7] carried out the experimental and numerical investigation on TCTHE, thermo-fluid performance and concluded that effectiveness and Nusselt number are higher than that of DTHE in counter flow configuration.…”

Section: Introductionmentioning

confidence: 99%

Analysis on thermal and flow behavior of triple concentric tube heat exchanger handling MWCNT-water nanofluids

Mukesh¹,

Visvanathan²

2020

THERM SCI

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Design of heat exchangers and heat transfer enhancement methods are struggling to meet out the cooling demand of present scenario. Many researchers suggested that the addition of nanosized solids particles into traditional base fluids resulting the higher heat transfer rate than the existing coolants and named the new fluids as nanofluids. In this investigation, the effect of microwave carbon nanotube (MWCNT)-water nanofluids on heat transfer rate, pressure drop and pumping power of a triple concentric tube heat exchanger are experimentally investigated and compared the results of MWCNT-water nanofluids with water. The MWCNT-water nanofluids were prepared by two step method at the volume concentrations of 0.2%, 0.4%, and 0.6%. The range of target fluid mass-flow rate is in the range of 0.026 to 0.039 kg per second and the constant heat flux condition is considered. On experimentation, it is noted that the effectiveness and pressure drop of 0.6% MWCNT-water based nanofluids are 27% and 21% greater than water at the maximum mass-flow rate. The reason for improved heat transfer rate of nanofluids is because of higher thermal conductivity, Brownian motion, lower boundary-layer thickness, and lower specific heat capacity of nanofluids. Also found that the pumping power increases with increasing volume concentration and pumping power is 25% higher than water at the 0.6% nanofluids. Therefore, the MWCNT-water nanofluids are good choice for replacing water as coolant in triple concentric tube heat exchanger.

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“…The performance analysis of a triple concentric tube heat exchanger under steady state conditions for insulated and non-insulated conditions was undertaken by G.A. Quadir et al [1], [2]. The experimentation was carried out using hot water, cold water and normal tap water for different flow arrangements.…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis and Performance Evaluation of Triple Concentric Tube Heat Exchanger

Lele

2019

IJEAT

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Triple concentric-tube exchanger (TCTHE) is an improved version of double concentric tube heat exchanger (DCTHE). Introducing an intermediate tube to a DCTHE provides TCTHE and enhances the heat transfer performance. Recognizing the need of experimental results, extremely scarce in the literature and essential to validate theoretical analyses, the aim of this work is to investigate thermal behavior of TCTHE. The present study includes design, development and experimental analysis of TCTHE for oil (ISO VG 22) cooling application required for industrial purposes. It comprises of water (cooling fluid) flowing through innermost tube as well as outer annulus and oil (hot fluid) flows through inner annulus. The experimental studies of the temperature distribution for three fluids along the length and heat transfer characteristics for TCTHE under insulated condition for counter current flow mode are carried out and discussed. The effect of change in oil (hot fluid) temperatures is analyzed keeping water inlet temperatures same at various operating conditions. The experiments have been conducted by varying flow rate of one of the fluids at a time and keeping other two fluid flow rates constant. The results are expressed in terms of temperature variation for all three fluids along the length. The effect of change in hot fluid inlet temperature is expressed in terms of heat transfer rate variation with respect to Reynolds number. The variation of non-dimensional parameters as temperature effectiveness and thermal conductance with respect to Reynolds number is also presented in this paper. Theoretical studies are carried out for evaluation of heat transfer rate using empirical correlations. Experimental validation is carried out for degree of cooling at different Reynolds numbers with theoretical analysis

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Numerical investigation of the performance of a triple concentric pipe heat exchanger

Cited by 57 publications

References 10 publications

Modelos de Ensuciamiento en Intercambiadores de Calor Tubulares en Sistemas indirectos en Procesos uHt en la Industria Láctea

Modelos de Ensuciamiento en Intercambiadores de Calor Tubulares en Sistemas indirectos en Procesos uHt en la Industria Láctea

Analysis on thermal and flow behavior of triple concentric tube heat exchanger handling MWCNT-water nanofluids

Thermal Analysis and Performance Evaluation of Triple Concentric Tube Heat Exchanger

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