Experiments were performed to determine the heat transfer to the suction surface of two film cooled first stage turbine vanes using two-row discrete hole cooling. Evaluation of the heat transfer to the film cooled vanes was made in a turbulent environment downstream of an aircraft turbojet engine combustor at moderately high primary gas stream temperatures and pressures. Results of these experiments provided quantitative data on the adiabatic film effectiveness for a number of blowing rates, and show decreased effectiveness levels when compared to measured values for a continuous slot in a wind tunnel environment. In addition the external heat transfer coefficients were obtained based on the difference between the film cooled adiabatic wall temperature and the wall temperature. The presence of film cooling holes increased the heat-transfer coefficients even without blowing. Further increases in the heat-transfer coefficients were measured in the presence of blowing with the largest increases in the region nearest the ejection.

Background: Carpal tunnel syndrome (CTS) is the most common entrapment neuropathy. There are multiple treatment modalities for CTS. This study examines both clinical and demographic predictors for initial treatment modality of CTS. Methods: Patients diagnosed with CTS between February 2015 and October 2020 with a hand clinic visit within 6 weeks before treatment were included in our study. Patients completed Patient-Reported Outcomes Measurement Information System Pain Interference, Physical Function, and Depression and had complete data on relevant predictor variables. Primary outcomes were treatment group: (1) injection only; (2) release only; and (3) injection followed by release. Bivariate analyses and multinomial logistic regression was used to identify statistically significant variables and independent predictors associated with the treatment groups, respectively. Results: A total of 1409 patients fit our inclusion criteria. Sex, age, body mass index (BMI), race, ethnicity, Pain Interference, and Depression were statistically significant predictors for treatment group in bivariate analysis ( P < .05). In multivariable analysis, adults older than 65 years were less likely to receive either injection only or injection followed by release (odds ratio [OR]: 0.56 and OR: 0.52, respectively; P < .01). Overweight (BMI: ≥25) individuals were less likely to receive injection only (OR: 0.45; P < .01). Women were more likely to have either injection only or injection followed by released (OR: 1.50 and 1.55; P < .01). Similarly, black, Indigenous, or Persons of Color had an increased odds of injection only and injection followed by release (OR: 1.61 and OR: 1.69, respectively; P < .05). Conclusions: Sex, age, BMI, race, and ethnicity were found to be independent predictors of treatment modality for CTS.

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Techniques to measure local film effectiveness distributions on large-scale models of turbine blade and vane sections were developed for use in subsonic, room-temperature wind-tunnel environments. Highly detailed film cooling effectiveness distributions were obtained on near-adiabatic, cast rigid foam test models using infrared radiometer scanning techniques. Sample results from both flat-plate film cooling studies and airfoil leading-edge film cooling studies are presented.