The effects of liquid flow rate, coil diameter, pseudo plasticity of the liquids on the frictional pressure drop for the flow through helical coils have been reported through experimental investigation. Numerical modeling is carried using Fluent 6.3 software to find its applicability in the flow system. The Computational Fluid Dynamics (CFD) simulations are carried out using laminar non-Newtonian pseudo plastic power law model for laminar flow and k-ε model for turbulent flow for water. Water and dilute solution of Sodium Carboxy Methyl Cellulose (SCMC) as a non-Newtonian pseudo plastic fluid used for the study. Both hexahedral and tetrahedral grids are used for this simulation. The CFD results show the very good agreement with the experimental values. The comparison of the non-Newtonian liquid flow and water are also reported. © 2015, The Institution of Engineers (India).

SUDIP DAS

Chemical Engineering

T K BANDYOPADHYAY

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Journal of The Institution of Engineers (India): Series E

Investigations have been carried out to evaluate the two-phase frictional pressure drop for air non-Newtonian liquid flow through helical coils in horizontal orientation. The experiments performed using 36 different helical coils and 4 different concentrations of sodium salt of carboxymethyl cellulose (SCMC) as non-Newtonian liquids. The effects of air and liquid flow rate, coil diameter, helix angle and liquid properties on two-phase frictional pressure drop have been discussed. An attempt has been made to fit the experimental two-phase frictional pressure drop data by the Lockhart and Martinelli, Chem. Eng. Prog. 45, 39-48 (1949) correlation and the modified Lockhart-Martinelli correlation as presented by different authors. In another approach, friction factor method was adopted to correlate the experimental data by dimensional analysis. The correlation developed predicts the two-phase frictional pressure drop with acceptable statistical accuracy.

Canadian Journal of Chemical Engineering

Frictional pressure drop of air non-newtonian liquid flow through helical coils in horizontal orientation

Experimental investigation have been carried out to evaluate the frictional pressure drop across different piping components such as orifices, gate and globe valves, elbows and bends in 0.0127 m piping components for non-Newtonian pseudoplastic liquid in laminar flow. Empirical correlations have been developed for the prediction of the frictional pressure drop in terms of the various physical and dynamic variables of the system. © 2006 Elsevier B.V. All rights reserved.

Journal of Petroleum Science and Engineering

Non-Newtonian pseudoplastic liquid flow through small diameter piping components

Helically coiled heat exchangers, where one of the working fluids is flowing through helical coil, are used in various process industries due to better heat transfer characteristics and the resulting compact layout. Out of these, process requirements make some of the heat exchangers to operate in air-water two-phase region. Even though the characteristics of their operation with single-phase working fluids are well documented, it is not so for the case of two-phase flows. There do exist few experimental results on hydrodynamics of air-water flow through helical pipes. However numerical investigation, which can give much insight into the physics of the problem, is lacking and this is the subject matter of this paper.Two-fluid Eulerian-Eulerian scheme available in FLUENT 6.3 is used in this analysis. Pitch circle diameter and pitch of the coil influence the nature of flow through helical coils. Another factor affecting the nature of two-phase flow in helical pipes is the diameter of the pipe. CFD analysis has been carried out by varying these parameters and their influence on thermal hydraulic characteristics of the two-phase flow are brought out. Subsequently analysis has been carried out by changing the inlet void fraction for a given value of the flow velocity. From these analyses, it has been established that correlations for heat transfer and pressure drop shall take into account the pitch circle diameter, pipe diameter and void fraction at the inlet. © 2009 The Institution of Chemical Engineers.

Chemical Engineering Research and Design

Thermal hydraulic characteristics of air-water two-phase flows in helical pipes

It has been well established that heat transfer in a helical coil is higher than that in a corresponding straight pipe. However, the detailed characteristics of fluid flow and heat transfer inside helical coil is not available from the present literature. This paper brings out clearly the variation of local Nusselt number along the length and circumference at the wall of a helical pipe. Movement of fluid particles in a helical pipe has been traced. CFD simulations are carried out for vertically oriented helical coils by varying coil parameters such as (i) pitch circle diameter, (ii) tube pitch and (iii) pipe diameter and their influence on heat transfer has been studied. After establishing influence of these parameters, correlations for prediction of Nusselt number has been developed. A correlation to predict the local values of Nusselt number as a function of angular location of the point is also presented. © 2009 Elsevier Ltd. All rights reserved.

Journal	Data powered by TypesetJournal of The Institution of Engineers (India): Series E
Publisher	Data powered by TypesetSpringer India
ISSN	2250-2483