Browsing by Author "Meyer, C. J."

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    A numerical investigation of the errors associated with the scaling of axial flow fan performance characteristics
    (Science Africa for the South African Institution of Mechanical Engineers, 2004) Meyer, C. J.; Kroger, D. G.
    The primary purpose of this numerical investigation is to determine the influence of scaling on the accuracy with which the fan performance characteristics of a scaled axial flow fan can be determined from those of a model fan with the use of the fan laws. The fan laws are based on the premise that similarity exists between the model and scaled fan velocity fields, and does not make provision for fan blade Reynolds number and surface roughness differences between the model and scaled fans. The numerical investigation is conducted using a commercially available computational fluid dynamics code. An axial flow fan model based on actuator disc theory is developed and incorporated into the commercial code. The use of the fan model greatly reduces grid complexity and processing power whilst maintaining a high degree of accuracy. The results of the numerical investigation indicate that, depending on the type of axial flow fan used as well as the operating conditions encountered, inaccuracies due to scaling can arise when using the fan laws to determine the scaled fan performance characteristics.
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    Post-discharge follow-up of stroke patients at Groote Schuur Hospital - a prospective study
    (Health & Medical Publishing Group, 1994) Whitelaw, D. A.; Meyer, C. J.; Bawa, S.; Jennings, K.
    A survey of 59 stroke patients was undertaken between 3 and 6 months after the event to determine whether a weekly stroke round would improve the rate of referral for rehabilitation. Comparison with a previous survey at Groote Schuur Hospital showed a marked improvement (40% for physiotherapy and 10% for occupational therapy v. 76% and 50% respectively). A comparison of referral rates between younger (<65 years old) and older patients (>65 years old) revealed a significantly higher rate of referral among the younger patients. Attendance for both groups was low (approx. 7 sessions per 3 months). Social work was an important requirement and 60% of all patients expressed a need for more help. Social needs of older and younger patients differ. Despite the improved referral rate the rehabilitation of stroke patients is unsatisfactory, mainly because of transport difficulties. Methods should be investigated to establish rehabilitation centres in the community to overcome this impasse.