The article examines the relationship of women and the objects surrounding them in the light of the term ‘affordance’. Coined by psychologist James J. Gibson, the term refers to the potentialities held by an object for a particular set of actions, stemming from its material properties. Through focusing on two case studies in which women use mundane objects (mainly pins and pestles) in violent situations – (a) stories (told by Herodotus and Euripides) about women attacking with pins, and (b) a group of vases representing women attacking with pestles – the article seeks to uncover a fundamental aspect of the engagement of women with the objects surrounding them, as envisioned by the men creating the literature and art. Deprived of almost any access to real weapons, these women are depicted as turning to objects in their immediate environment. Perceiving the affordances of these objects, stemming from their shape and material and the inherent potentialities for action, the women make use of them in acts of self-defence, anger, or revenge.

Cooling methods are needed for turbine blade tips to ensure a long durability and safe operation. A common way to cool a tip is to use serpentine passages with 180-deg turn under the blade tip-cap taking advantage of the three-dimensional turning effect and impingement like flow. Improved internal convective cooling is therefore required to increase the blade tip lifetime. In the present study, augmented heat transfer of an internal blade tip with pin-fin arrays has been investigated numerically using a conjugate heat transfer method. The computational domain includes the fluid region and the solid pins as well as the tip regions. Turbulent convective heat transfer between the fluid and pins, and heat conduction within pins and tip are simultaneously computed. The main objective of the present study is to observe the effect of the pin material on heat transfer enhancement of the pin-finned tips. It is found that due to the combination of turning, impingement and pin-fin crossflow, the heat transfer coefficient of a pin-finned tip is a factor of 2.9 higher than that of a smooth tip at the cost of an increased pressure drop by less than 10%. The usage of metal pins can reduce the tip temperature effectively and thereby remove the heat load from the tip. Also, it is found that the tip heat transfer is enhanced even by using insulating pins having low thermal conductivity at low Reynolds numbers. The comparisons of overall performances are also included.