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Neil John Alderman

Neil John Alderman

1979: BSc in Chemical Engineering, 1986: PhD in Chemical Engineering
Retired. Ex-provider of rheology/slurry handling consultancy and training courses to industry.

About

81
Publications
81,988
Reads
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745
Citations
Citations since 2016
9 Research Items
199 Citations
20162017201820192020202120220102030
20162017201820192020202120220102030
20162017201820192020202120220102030
20162017201820192020202120220102030
Introduction
I am now retired having been a senior consultant for BHR Group providing a rheology/slurry handling consultancy service for the chemical, food, mineral, nuclear and wastewater industries in UK and worldwide. I was also involved with the various industrial consortia run by BHR Group. Together with Dr Nigel Heywood, we ran open and in-house courses on rheology and slurry handling. I am an author/co-author of 232 papers and reports of which 55 are in the public domain.
Additional affiliations
January 2009 - January 2015
Cape Peninsula University of Technology
Position
  • External D Tech. supervisor and M.Tech. examiner
Description
  • Theses: Johan Burger, Non-Newtonian flow in open channels – The effect of shape,. D. Tech. in Mechanical Engineering gained 16 July 2014. Christine Mahemba Wa Kabwe, Transitional flow of non-Newtonian fluids in open channels of different shapes, M.Tech in Chemical Engineering, Jan 2015. Emile Van der Heever, Rheological model influence on pipeflow predictions for homogeneous non-Newtonian fluids,, M.Tech in Civil Engineering, Dec 2013.
October 2005 - May 2015
BHR Group
Position
  • Senior Consultant (Grade 5) – Rheology, Slurry Handling and Mixing
June 2003 - October 2005
Aspen Technology
Position
  • Advisor (Band 4) – Non-Newtonian Rheology and Wet Solids Handling
Education
October 1979 - January 1986
University of Bath
Field of study
  • Chemical Engineering
October 1975 - June 1979
University of Bath
Field of study
  • Chemical Engineering

Publications

Publications (81)
Conference Paper
Full-text available
An alternative approach based on a general expression derived for laminar non-Newtonian flow in open channels of different cross-sectional shapes using key primary variables is presented. This enabled the channel flow data, which is traditionally presented as a plot of f vs Re_H on logarithmic coordinates from which C is obtained from the -1 slope...
Conference Paper
Full-text available
This paper reports measurements of the rheology of a range of water-based drilling muds at temperatures up to 130oC and pressures up to 1000 bar. The fluids are highly thixotropic; decoupling of temperature/pressure effects from those due to time-dependent structural changes was achieved by developing a sample preparation and handling procedure whi...
Conference Paper
Full-text available
The hydraulics of two pipeline sections of the 387mm ID MVSP in north-west England were analysed for several mixtures of primary digested (PD) and thermally-hydrolysed (TH) digested sludge. Both pump discharge and suction pressures were estimated at various total solids concentrations (TS). The main aim of the study was to determine the required pu...
Article
We describe the use of a four-bladed vane to measure the yield stress τ0 of a series of aqueous bentonite clay suspensions. An extension of the vane technique is given, showing how the shear modulus G and the yield strain γy can also be obtained. These techniques are validated by comparing the results with those obtained from conventional concentri...
Article
The effect of channel shape on the friction factor-Reynolds number relationship for laminar, open channel flow of three non-Newtonian fluids was investigated. For each channel shape, the data can be described by a general relationship, f=K/Re where f is the Fanning friction factor and Re is the appropriate Haldenwang et al. (2002) Reynolds number c...
Conference Paper
Full-text available
Nanocomposites comprising delaminated nanoclays result in superior properties of the final product. This study aimed at monitoring the processes of intercalation and exfoliation of different nanoclay-polyol pairs performed through different dispersion protocols. X-ray diffraction, rheology and particle sizing are discussed in relation to the evolvi...
Presentation
Full-text available
The total dynamic heads (TDH) across either two or three identical centrifugal pumps in series were estimated for 50%, 58% and 60% by mass phosphate ore slurry concentrations for two of the ten ore slurry distribution pipeline layouts at the Jorf Lasfar terminal facilities in Morocco. The two pipeline internal diameters used were 182.5 mm and 285.7...
Conference Paper
Full-text available
The total dynamic heads (TDH) across either two or three identical centrifugal pumps in series were estimated for 50%, 58% and 60% by mass phosphate ore slurry concentrations for two of the ten ore slurry distribution pipeline layouts at the Jorf Lasfar terminal facilities in Morocco. The two pipeline internal diameters used were 182.5 mm and 285.7...
Conference Paper
Full-text available
Phosphate mines and beneficiation facilities at Khouribga in Morocco, a slurry transportation system including a 187-km long pipeline (1), and terminal facilities at Jorf Lasfar have all been developed to increase phosphate production. These facilities include the pipeline terminal station at Jorf Lasfar to receive slurry via four large storage tan...
Conference Paper
Full-text available
A sand/clay slurry pipeline has failed to deliver the required solids throughput of 90 t/h, providing only 57 to 63 t/h solids. To improve the throughput, this study considered replacement of the existing rubber-lined centrifugal pump impeller running at its limit of 1000 rpm with a hardened steel impeller running at 1200 rpm. Estimates of friction...
Presentation
Full-text available
Phosphate mines and beneficiation facilities at Khouribga in Morocco, a slurry transportation system including a 187-km long pipeline (1), and terminal facilities at Jorf Lasfar have all been developed to increase phosphate production. These facilities include the pipeline terminal station at Jorf Lasfar to receive slurry via four large storage tan...
Presentation
Full-text available
A sand/clay slurry pipeline has failed to deliver the required solids throughput of 90 t/h, providing only 57 to 63 t/h solids. To improve the throughput, this study considered replacement of the existing rubber-lined centrifugal pump impeller running at its limit of 1000 rpm with a hardened steel impeller running at 1200 rpm. Estimates of friction...
Article
Full-text available
New models for the prediction of laminar and turbulent flow of non-Newtonian fluids in open channels of different cross-sectional shapes are proposed. These models are compared with three previously-published models for laminar flow and five previously-published models for turbulent flow using our recently extended experimental database for non-New...
Article
Full-text available
Extensive experimental results conducted in a 10-m flume for various types of non-Newtonian fluids spanning a range of cross-sectional open channel shapes are presented and analysed in depth in this work. Open channel flow of non-Newtonian slurries is relevant in mining and chemical engineering applications. This database coupled with the literatur...
Poster
Full-text available
Özcan-Taşkın, G., Padron, G., Alderman, N.J., & Cheah, A. (2014). Evolution of Dispersion Properties during the Delamination of Nanoclays. NanoEx3, International Conference on Industrial Processes for Nanomaterials, 1st July, Cambridge, UK. POSTER.
Conference Paper
Full-text available
The correct usage of rheology data is important in the mobilisation, mixing and transport of nuclear waste sludge from tanks/silos/pond to the treatment plant. Because of their radioactive nature, rheological characterisation of the waste sludge is an extremely difficult task. Limited datasets have revealed that these sludges do exhibit thixotropic...
Chapter
Full-text available
The focus of this chapter is to provide a review of the loss coefficient data for laminar flow of non-Newtonian fluids in pipe fittings. Since the total pressure change in a piping system generally consists of three components: (i) the frictional pressure loss in the pipe, (ii) the frictional pressure loss arising from flow through fittings and (ii...
Conference Paper
Full-text available
This paper summarises appropriate approaches for the prediction of frictional pressure loss across pipework and pipe fittings for “non-settling” sludges and slurries to assist in the development of a system curve. This curve, combined with centrifugal pump characteristics define alternative possible duty points, depending on pump impeller speed. Be...
Conference Paper
Full-text available
The correct usage of rheology data is important in the mobilisation, mixing and transport of nuclear waste sludge from tanks/silos/pond to the treatment plant. Because of their radioactive nature, rheological characterisation of the waste sludge is an extremely difficult task. Limited datasets have revealed that these sludges do exhibit thixotropic...
Conference Paper
Full-text available
Data for laminar non-Newtonian flow in various non-circular open channels can be described by a general relationship, f = K/ReH where f is the friction factor and ReH is the appropriate Haldenwang et al Reynolds number corresponding to the rheological model used to describe the non-Newtonian behaviour exhibited by the test fluid. The K values were...
Article
Full-text available
The database for non-Newtonian flow in rectangular open channels developed by the Flow Process Research Centre at the Cape Peninsula University of Technology was recently extended to include the testwork on non-Newtonian flow in open channels of semi-circular, triangular and trapezoidal cross-sections. As for flow in rectangular open channels, the...
Conference Paper
Full-text available
Pump selection and sizing for transport of sewage sludge and other non-Newtonian biosolid slurries has important capital and operating cost implications. Under-sizing results in an inability to achieve required process throughput whilst over-sizing leads to excessive capital cost and energy consumption. Selection and sizing are dependent on the sys...
Conference Paper
Full-text available
A survey of methods used to measure the ”viscosity” of settling suspensions suggest that they can be grouped as follows i. Methods of maintaining particles in suspension during viscosity measurement using rotational and tube viscometry; ii. Metzner–Otto method using an agitator instead of a conventional viscometric geometry; iii. Extrapolation to z...
Conference Paper
Full-text available
Flumes are ubiquitous throughout the mining and minerals processing industries as well as being used in the polymer processing and pulp and paper industries. With the increased demand for the transport of highly-concentrated slurries in rectangular open channels, there is an impetus for a better understanding of the role of rheology in flow hydraul...
Conference Paper
Full-text available
The effects were studied of the presence of comminuted flint on the rheological characteristics of chalk slurry pumped through a 92-km long pipeline from Kensworth Quarry to Rugby Cement Works in the UK, and their impact on the pipe flow conditions. Flow curves were measured for 63 different chalk slurry samples; these were described by the Bingham...
Conference Paper
Full-text available
Energy gradient prediction is arguably the most important aspect of slurry pipeline design. For non-Newtonian slurries, pipeline design, operation and optimisation is dependent on how well the flow curve of the slurry can be measured. Because of geometric similarity, tube viscometry for flow curve measurement is often preferred to rotational viscom...
Conference Paper
Full-text available
Many slurries exhibit time-dependent rheological properties. The most commonly-met time-dependent property is thixotropy, which is normally exhibited with shear-thinning behaviour. One way to reduce the frictional pressure loss in pipeline transport, and therefore pumping costs, for thixotropic slurries is to agitate the slurry in the feed vessel f...
Article
Full-text available
Use these methods to ensure the flow curve used for engineering design is both accurate and relevant.
Conference Paper
Full-text available
Work carried out on frictional pressure losses arising from the flow of Newtonian and non-Newtonian slurries through valves is very sparsely reported in the literature. The data available from the various literature sources were collated and reviewed in 2001 in a joint project between Cape Technikon, ESDU International and Aspen Technology. This pa...
Conference Paper
Full-text available
In the last few years, interest in the design of handling and transfer systems involving highly concentrated, fine particle non-Newtonian slurries has increased substantially. This is to some extent the result of increased interest in the disposal of high concentration tailings in the mining industry, either on land or through mine backfilling, and...
Article
Full-text available
Various techniques for measuring the rheological properties of slurry for engineering applications are discussed. The procedures of making both accurate and relevant flow curves and the parameters describing how the flow curve may be estimated for use with correlations suited to specific engineering applications are also discussed. Flow curve measu...
Conference Paper
Full-text available
It is important to try to obtain reliable measurements of the rheological properties of thickened tailings and other pastes when designing pipeline systems, and specifying associated equipment. This paper will outline a methodical approach to rheological measurements.
Technical Report
Full-text available
This Data Item is the fourth in a group on the flow characteristics of non-Newtonian fluids. It contains a practical worked example that illustrates how to obtain, using a laboratory-scale tube viscometer, the relevant viscometric data necessary for frictional pressure loss estimation for full-scale pipeflow.
Article
Full-text available
Developments in slurry-handling technology (SHT) continue to be applied across the process industries, particularly in the modeling pipeline of flow, and in the design and selection of pumps, agitated-slurry storage vessels and online instrumentation. These developments are applicable to the design and operation of systems involving both in-plant s...
Article
Full-text available
I wish to point out some fundamental errors in the article, “Optimize Pipeline Design for Non-Newtonian Fluids,” by Alejandro Durand, et. al. in the March 2002 issue of CEP.
Conference Paper
Full-text available
Rugby Cement pumps chalk slurry at approximately 36% by weight moisture content from the Kensworth chalk quarry near Dunstable, UK, to their Rugby Works. A study was made of the combined effects of chalk slurry moisture content and options for different pipe diameters on the pump discharge pressure requirement. In addition, the pumping power requir...
Conference Paper
Full-text available
The effects of chalk slurry properties and operational variables on pipe flow conditions were investigated as part of a study to optimise chalk slurry transfer through the Rugby Cement 92 km long pipeline from Kensworth Quarry, near Dunstable, to Rugby in the UK. To try to overcome the settling tendency of >0.3mm coarse fraction comprising mainly o...
Conference Paper
Full-text available
There has been a limited amount of work done on frictional pressure losses arising from the flow of various types of non-Newtonian fluids through pipe fittings and the results have been published in a variety of places. A comprehensive review of this work was carried out for the Slurry Handling part of Hyprotech’s Process Manual in 2001. The object...
Conference Paper
Full-text available
A recent survey carried out for the Wet Solids Handling Project (1,2) on commercially-available on-line viscometers suggests that these can be grouped by measurement technique into seven generic types. This paper will give a brief description of each viscometer type together with its advantages, limitations and slurry applications. Factors affectin...
Technical Report
Full-text available
This Data Item, the first of a group on the flow properties of non-Newtonian fluids, provides an introductory guide to the classification and characteristics of homogeneous fluids, polymeric solutions and melts or non-settling (pseudohomogeneous) suspensions which are composed of solid particles, undissolved polymer or droplets of a denser or light...
Technical Report
Full-text available
This Data Item is one of a series on the flow properties of non-Newtonian fluids. The first, ESDU 820361 provides an introductory guide to the classification and characteristics of non-Newtonian fluids. The second, ESDU 910252 outlines the various methods available for estimating frictional pressure losses for fully-developed isothermal flow of non...
Conference Paper
Full-text available
A survey of valves for slurry applications carried out for the Wet Solids Handling Project in 1996 has demonstrated the increasing choice offered by manufacturers. This paper summarises the main features of this survey. It provides a description of all generic valve types together with their operating conditions, advantages and limitations, and app...
Technical Report
Full-text available
This Data Item is one of a series on the flow properties of non-Newtonian fluids. The first, ESDU 82036 provides an introductory guide to the classification and characteristics of non-Newtonian fluids. The second, ESDU 91025 outlines the various methods available for estimating frictional pressure losses for fully-developed isothermal flow of non-N...
Article
Full-text available
A variety of industries produce sludge residues from their manufacturing and processing operations. The main types of sludge generated by waste treatment and industrial processes can be divided into two categories: inorganic and organic. Prior to being handled or processed, sludges must be characterized for pathogenicity, toxicity and a variety of...
Article
Full-text available
The WSL Applied Rheology Section, about to be transferred to AEA Technology, has an extensive range of viscometers and rheometers capable of measuring shear rates in the range of 10^-6 - 10^6 s^-1. The following article discusses the need to use the correct shear rate (or shear stress) window when making viscosity measurements.
Conference Paper
Full-text available
The need for developing international rheological measurement standards was outlined by my colleague Nigel Heywood in a recent article [1]. In the concluding remarks, it was mentioned that Warren Spring Laboratory (WSL) and Physikalisch-Technische- Bundesanstalt (PTB) intend to embark upon a joint programme of work which, it is hoped, will be funde...
Article
Full-text available
The need for developing international rheological measurement standards was outlined by my colleague Nigel Heywood in a recent article [1]. In the concluding remarks, it was mentioned that Warren Spring Laboratory (WSL) and Physikalisch-Technische- Bundesanstalt (PTB) intend to embark upon a joint programme of work which, it is hoped, will be funde...
Article
Full-text available
Two probable mechanisms exist whereby the overall coefficient of a heat exchanger can be increased when fouling occurs. These are the creation of roughness elements and restrictions to flow, both of which increase film heat transfer coefficients. The change ( increase/decrease) in the overall heat transfer coefficient due to the formation of deposi...
Article
The standard lubrication analysis for a squeeze flow of a Bingham fluid is reviewed, and then extended to the case of a fluid in which the yield stress varies as a function of depth. These analyses are used to obtain the yield stress τ0 from squeeze-film measurements made on uniform mudcakes formed by filtration of a typical bentonite mud. Over the...
Article
Full-text available
Conference Paper
Full-text available
The interpretation of MWD and wireless logs of invaded formations can be enhanced by an understanding of the controls on invasion rates. Experimental investigation of dynamic filtration rates has shown that under certain conditions these are dependent only on the hydraulic shear stress at the mudcake surface for a given mud composition. They are vi...
Article
Full-text available
The concentration profiles within filtercakes of bentonite particles have been studied. A theoretical analysis of filtration is presented, and is compared to results obtained by cake dissection experiments. The constitutive relations which control short-term compaction of the cake are determined. Long-term cake-creep is also observed, and it is sho...