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Aim and objective -To compare with different site of infection & comorbidities among study group Study of various clinical features to rule out accurate diagnosis. To use negative pressure wound therapy (NPWT) in patients with chronic venous leg ulceration. Material and method-The present study was conducted in department of general surgery Rajshree medical research institute, BareillyThis is an observation and comparative type of study. Result and conclusion-Healing of chronic leg ulcer is a complex process attributed to several elements. Although various parameters earlier proved to positively affect the healing of ulcers but the present study recommends that V.A.C. therapy should be considered as the treatment of choice for chronic leg ulcers owing to its significant advantages in the time to complete healing compared with conventional wound care. In this present study V.A.C. therapy overall appears to be superior to other wound care techniques. [ABSTRACT FROM AUTHOR]

Results of an investigation into the sensitivity of natural convection heat transfer correlations with respect to relative humidity are presented. Given the relatively small values of natural convection heat transfer coefficients, small changes in the thermophysical properties can have a significant impact on the values predicted by theoretical/empirical correlations. In this study, the thermophysical properties are assumed to be those of a dry air and water vapor mixture. The mole fractions are determined as a function of relative humidity. Several widely used natural convection heat transfer correlations have been examined to determine the impact of varying the relative humidity on the predicted Nusselt number. The results show a general trend of an increasing Nusselt number with relative humidity. The results presented in this paper provide an engineering tool for obtaining accurate values of natural convection heat transfer coefficients for a moist air environment using only the thermophysical properties of dry air. [ABSTRACT FROM AUTHOR]